AP1231G-A-K9 access points - very slow throughput - Is TKIP the issue?

I recently setup our small office network using the following setup:
Cablemodem <--> router <--> 1231AP(role root bridge with wireless clients) <-> 1231AP(role non-root bridge with wireless clients)
Code on both APs: 12.3(8)JEE
Office network generally has less than 3 wireless clients connected at any one time to either AP.
AP's are a mere 50' apart; clients are all less than 30' from either AP; they all show excellent signal and connected at 54mbps signaling rates.
All is/has been working very well & very stable with the exception of speed. We have business class service from RR, approx 25mbps dl, 2mbps ul. Any hardwired client to the router switch ports are able to download at speeds averaging 23mbps. Any wireless client connected to either AP is never able to exceed download speeds of 5mbps. With no other wireless clients connected except my one test client, I was not able to exceed 5mbps throughput from either AP that I connected to.
I can confirm that the ethernet connection between the router and root bridge is up at 100mbps-FD and not showing any errors:
ap#sh interfaces FastEthernet0
FastEthernet0 is up, line protocol is up
  Hardware is PowerPC405GP Ethernet, address is 0013.60cf.bb29 (bia 0013.60cf.bb29)
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Full-duplex, 100Mb/s, MII
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/160/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 5000 bits/sec, 0 packets/sec
  5 minute output rate 1000 bits/sec, 1 packets/sec
     8054605 packets input, 3141009145 bytes
     Received 46005 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog
     0 input packets with dribble condition detected
     4076106 packets output, 411952731 bytes, 0 underruns
     0 output errors, 0 collisions, 4 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
Wandering thru the cli on either AP shows that all wireless clients are indeed connected at 54mbps to their respective AP and the two AP's are connected happily at 54mbps signaling:
Address           : 0013.1a37.b3e0     Name             : ap
IP Address        : 192.168.0.120      Interface        : Dot11Radio 0
Device            : 11g-bridge         Software Version : 12.3
CCX Version       : NONE
State             : Assoc              Parent           : Our Parent        
SSID              : Tsunami
VLAN              : 0
Hops to Infra     : 0                  Association Id   : 44
Tunnel Address    : 0.0.0.0
Key Mgmt type     : WPA PSK            Encryption       : TKIP
Current Rate      : 54.0               Capability       : WMM ShortHdr ShortSlot
Supported Rates   : 1.0 2.0 5.5 6.0 9.0 11.0 12.0 18.0 24.0 36.0 48.0 54.0
Voice Rates       : disabled
Signal Strength   : -51  dBm           Connected for    : 75169 seconds
Signal to Noise   : 26  dB            Activity Timeout : 14 seconds
Power-save        : Off                Last Activity    : 1 seconds ago
Apsd DE AC(s)     : NONE
Packets Input     : 1050695            Packets Output   : 296536   
Bytes Input       : 474651248          Bytes Output     : 96734573 
Duplicates Rcvd   : 0                  Data Retries     : 63646    
Decrypt Failed    : 0                  RTS Retries      : 0        
MIC Failed        : 0                  MIC Missing      : 0        
Packets Redirected: 0                  Redirect Filtered: 0
Here is a config snippet from the AP non-root bridge with wireless clients:
dot11 ssid Tsunami
   authentication open
   authentication key-management wpa
   guest-mode
   infrastructure-ssid optional
   wpa-psk ascii 7 (snipped)
bridge irb
interface Dot11Radio0
no ip address
no ip route-cache
encryption mode ciphers tkip
ssid Tsunami
speed basic-1.0 2.0 5.5 6.0 9.0 11.0 12.0 18.0 24.0 36.0 48.0 54.0
station-role non-root bridge wireless-clients
bridge-group 1
bridge-group 1 subscriber-loop-control
bridge-group 1 spanning-disabled
interface FastEthernet0
no ip address
no ip route-cache
duplex auto
speed auto
bridge-group 1
bridge-group 1 spanning-disabled
interface BVI1
ip address dhcp client-id FastEthernet0
no ip route-cache
bridge 1 route ip
(The AP root-bridge with wireless clients config is identical to this config with the exception of the station-role and a static IP on the BVI1 interface.)
Are these very slow thoughput speeds normal of this hardware combination?
I did much searching/googling and found claims that by eliminating TKIP it almost doubles the actual wireless speeds our clients can obtain. Is there any truth to this?
Any suggestions or recommendations without changing hardware would be very welcome.
Thanks in Advance!
D.
=============

Ok, thanks for the explanation - I understand. But even at a 22mbps signaling rate shouldn't I be seeing throughputs greater than 5-5.5mbps especially since this location is literally 100% free of any outside interference and the interfaces definitely show the clients and non-root bridge (when connected) all being at the highest rate of 54mbps? I tried even in the same room, approximately 40' away, total line of sight, no obstructions, between my laptop and the root AP.
I disconnected the non-root bridge and connected directly to the root bridge during my testing. I was still only able to achieve approx 5.5mbps download. Adding back in the non-root bridge and re-connecting to it I notice slightly lower throughput, approx 5mbps. During testing, my laptop was the only device connected to the network, all other clients were shut off.
Here are the int stats (I've never reset the counters):
Root Bridge:
RATE 1.0 Mbps
Rx Packets:           2178725 /  49    Tx Packets:                   39 /   0
Rx Bytes:            335124036 /7595    Tx Bytes:                   4965 /   0
RTS Retries:               61 /   0    Data Retries:                  5 /   0
Non-Root-Bridge:
RATE 1.0 Mbps
Rx Packets:           2323120 /  50    Tx Packets:                  141 /   0
Rx Bytes:            336455923 /7595    Tx Bytes:                  17869 /   0
RTS Retries:                2 /   0    Data Retries:                 56 /   0
All the other rates, 2-12mbps show single or double digit packet/byte counts until I get to the 36mbps section of each interface:
ap#sh int Dot11Radio0 stati
        DOT11 Statistics        (Cumulative Total/Last 5 Seconds):
(snipped for brevity)
Root Bridge:
RATE 36.0 Mbps
Rx Packets:            915395 /   1    Tx Packets:              2345589 /   9
Rx Bytes:            93420936 /  70    Tx Bytes:             3370791285 / 874
RTS Retries:                0 /   0    Data Retries:             573981 /   4
RATE 48.0 Mbps
Rx Packets:           2163192 /   2    Tx Packets:               216861 /   0
Rx Bytes:            222455730 / 404    Tx Bytes:              182817967 /   0
RTS Retries:                0 /   0    Data Retries:             106808 /   0
RATE 54.0 Mbps
Rx Packets:            987986 /   0    Tx Packets:               168923 /   0
Rx Bytes:            190467269 /   0    Tx Bytes:               61665042 /   0
RTS Retries:                0 /   0    Data Retries:              34424 /   0
Non-Root Bridge:
RATE 36.0 Mbps
Rx Packets:           2368679 /   0    Tx Packets:               965419 /   0
Rx Bytes:            3396819830 /   0    Tx Bytes:               90880825 /   0
RTS Retries:                0 /   0    Data Retries:             242686 /   0
RATE 48.0 Mbps
Rx Packets:            341870 /   0    Tx Packets:              2156282 /   1
Rx Bytes:            216497093 /   0    Tx Bytes:              215775536 / 210
RTS Retries:                0 /   0    Data Retries:             478619 /   0
RATE 54.0 Mbps
Rx Packets:           1469926 /  15    Tx Packets:              2529678 /  15
Rx Bytes:            411722698 /1122    Tx Bytes:             1366306113 /5159
RTS Retries:                0 /   0    Data Retries:             198532 /   0
I will try disabling the rates below 12mbps and re-test.
I would like to try disabling all encryption and try as well.
Do you know if the AP's will associate if there is zero encryption?

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