"Poor Signal", "Coverage hole pre alarm for client" after changing from Autonomous to Lightweight infrastruture

Dears,
I use to have wireless infrastructure based on autonomous APs 1142n, auth w/ 802.1x and everything was fine.
My Company decided to implement WLC 5508, and I changed only 2nd floor (2 APs) as lightweight and implement WLC over there as pilot testing...
Now All persons here (around 35 clients) are complaining about disconnections, poor signal...
Both APs are distant each other maximim of 15 meters... Our office has a medium open spaced room, with (20 X 15 meters) only 2 "Pilaster" in the middle of the room.
I am facing this message at WLC logs
Thu Nov 1 16:03:57 2012
Coverage hole pre alarm for client[1] 00:37:6d:eb:67:44 on 802.11a interface of AP 00:26:cb:4c:8e:b0 (AP01-RJOBTF). Hist: 1 0 3 4 1 1 2 7 2 9 10 13 4 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Thu Nov 1 15:55:21 2012
Rogue AP : 7c:4f:b5:ed:27:a1 detected on Base Radio MAC : 1c:aa:07:6e:93:20 Interface no:0(802.11b/g) on Channel 11 with RSSI: -92 and SNR: 1 and Classification: unclassified
Thu Nov 1 15:50:27 2012
Coverage hole pre alarm for client[1] 28:e0:2c:6d:11:58 on 802.11b/g interface of AP 00:26:cb:4c:8e:b0 (AP01-RJOBTF). Hist: 0 0 2 5 11 16 9 2 5 12 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Is there any best practices I should perform over here ?
Any specific configuration with the signal itself ? In my opinion we dont have a big room here .. 2 APs should work very well... but they are not...
I also can see many Rogue APs... I am not sure if that rogues aps have anything to do with this problem.... also I didnt change anything at 3rd floor (not sure if the
Thanks in advance!!!

Actually I am using both APs as lightweight in 2nd floor.
How about this power level? where I can find those parameters ?
At 3rd floor all APs are autonomous, I accessed one of them and find this parameter
CCK Transmitter Power (dBm):           Max
OFDM Transmitter Power (dBm):           Max
Client Power (dBm):                     Max
is that the parameter you talked about ?
At WLC I found this screen
Tx Power Level Assignment Algorithm
Power Level Assignment Method
Automatic
On Demand
Fixed
                         1                         2                         3                         4                         5
Maximum Power Level Assignment (-10 to 30 dBm)
Minimum Power Level Assignment (-10 to 30 dBm)
Power Assignment Leader
Last Power Level Assignment
Power Threshold (-80 to -50 dBm)
Power Neighbor Count
Should I check anything else ?
Thanks in advance!!!

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