Wireless Bridge Help

Hi all,
I have a Wireless P2P bridge set up between two buildings.  They are about 450 feet apart, Root bridge has a 16dbi Yagi antenna (ebay) and nonroot has a 12dbi Flat Panel antenna.  Both bridges are 1231G APs set to Root and Nonroot mode, respectively.  I have a few questions.  Right now the link is working and is reliably connected.  My data rates right now are 1.0  ,  2.0  ,  5.5  ,  6.0  ,  9.0  ,  11.0  ,  12.0  ,  18.0  ,  24.0  ,  36.0  ,  48.0  ,  54.0                                   Mb/sec on both sides.  I consistenly get on the lower end of the scale, usually hovering around 5.5-12mb/sec range on the nonroot side.  Root is typically transmitting at 48 or 54 mb. 
My signal should be pretty good at -61 and 34-37 SNR, right?
At work we have a wireless bridge (1310 hardware) and it is set to :::speed  basic-9.0 basic-12.0 basic-18.0 basic-24.0 basic-36.0 basic-48.0 basic-54.0::: so I went into mine (1231G hardware) and set it to the same.  Voila!  I connected at 24-54mb.  All seemed well - until I noticed that now that I wasnt using the B rates, I had a spotty connection that was going up and down.  Changed it back to all rates, and I again have a stable connection. 
What can I do to stabilize and set the connection to OFDM rates so it will be fast and reliable?  The distance really shouldnt be an issue, and I can see from one antenna to the other.  Would 2 panel antennas be better?  Should I find higher gain antennas?  Should I switch to the 1310 hardware because it is designed as a bridge?  HELP!!! 
Here is the output from the Root side:
Root#sh dot11 associations all-client
Address           : 0014.a86f.2b50     Name             : NonRoot
IP Address        : 10.10.81.3         Interface        : Dot11Radio 0
Device            : 11g-bridge         Software Version : 12.3
CCX Version       : NONE
State             : EAP-Assoc          Parent           : self              
SSID              : WT3342NET
VLAN              : 0
Hops to Infra     : 1                  Association Id   : 160
Clients Associated: 1                  Repeaters associated: 0
Tunnel Address    : 0.0.0.0
Key Mgmt type     : NONE               Encryption       : WEP
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   : -61  dBm           Connected for    : 925 seconds
Signal to Noise   : 34  dB            Activity Timeout : 28 seconds
Power-save        : Off                Last Activity    : 2 seconds ago
Apsd DE AC(s)     : NONE
Packets Input     : 7521               Packets Output   : 4241     
Bytes Input       : 2893219            Bytes Output     : 650362   
Duplicates Rcvd   : 0                  Data Retries     : 1375     
Decrypt Failed    : 0                  RTS Retries      : 0        
MIC Failed        : 0                  MIC Missing      : 0        
Packets Redirected: 0                  Redirect Filtered: 0        
Session timeout   : 0 seconds
Reauthenticate in : never
And here is the output from the NonRoot side:
NonRoot#sh dot11 associations all-client
Address           : 0013.c365.6190     Name             : Root
IP Address        : 10.10.81.2         Interface        : Dot11Radio 0
Device            : 11g-bridge         Software Version : 12.3
CCX Version       : NONE
State             : EAP-Assoc          Parent           : Our Parent        
SSID              : WT3342NET
VLAN              : 0
Hops to Infra     : 0                  Association Id   : 143
Tunnel Address    : 0.0.0.0
Key Mgmt type     : NONE               Encryption       : WEP
Current Rate      : 5.5                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   : -60  dBm           Connected for    : 1012 seconds
Signal to Noise   : 37  dB            Activity Timeout : 15 seconds
Power-save        : Off                Last Activity    : 0 seconds ago
Apsd DE AC(s)     : NONE
Packets Input     : 14106              Packets Output   : 7646     
Bytes Input       : 2176272            Bytes Output     : 2908380  
Duplicates Rcvd   : 0                  Data Retries     : 3136     
Decrypt Failed    : 0                  RTS Retries      : 661      
MIC Failed        : 0                  MIC Missing      : 0        
Packets Redirected: 0                  Redirect Filtered: 0 

Hi George,
Tonight I installed a matching panel antenna (l-com HP2414) on my side, and have similar results (actually worse results at first).  I upped my side transmit to CCK 30 and OFDM 30 from 20/20 and now have about the same performance (see red below).  I have a question - how important is it to have the wifi antenna clear?  I have it mounted on the same mast as our TV antenna- see pic attached.  Should I move it to it's own mast?  I can mount another one on a second chimney if necessary, or raise the TV antenna up a few feet. 
I am also not past sticking a yagi at both sides if that will improve my signal to noise ratio...connection still is around 36-54mb, but download speeds on the other side are still only 6mb, not the full 25 we get on the wire off the core, or even the 16 I got on the test nonroot bridge I set up at the same side as the root.
NonRoot#sh dot11 associations all
Address           : 0013.c365.6190     Name             : Root
IP Address        : 10.10.81.2         Interface        : Dot11Radio 0
Device            : 11g-bridge         Software Version : 12.3
CCX Version       : NONE
State             : EAP-Assoc          Parent           : Our Parent        
SSID              : WT3342NET
VLAN              : 0
Hops to Infra     : 0                  Association Id   : 199
Tunnel Address    : 0.0.0.0
Key Mgmt type     : NONE               Encryption       : WEP
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   : -65  dBm           Connected for    : 9517 seconds
Signal to Noise   : 32  dB            Activity Timeout : 15 seconds
Power-save        : Off                Last Activity    : 0 seconds ago
Apsd DE AC(s)     : NONE
Packets Input     : 95379              Packets Output   : 10182    
Bytes Input       : 15774260           Bytes Output     : 2163933  
Duplicates Rcvd   : 0                  Data Retries     : 7927     
Decrypt Failed    : 0                  RTS Retries      : 168      
MIC Failed        : 0                  MIC Missing      : 0        
Packets Redirected: 0                  Redirect Filtered: 0        

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