High Transmit discards on 1131AG Access points.

I am running a number of AP1131AG access points that are showing transmit discards in the millions each day on the dot11G radio.
all of these AP's are configured to use WPA/PSK and TKIP. All are running IOS 12.3(8)JEA.
I'm puzzled by this as I also have a number of older 1231G access points that do not have the same problem.
Can anyone tell me what might be causing such a high number of discarded packets my 1131's

Use the command on the AP "sh dot11 associations" will give you clients which have successfully associated.  If you add the client MAC address at the end of the command you'll get a detailed information.  Look under "Signal Strength" and "Signal to Noise".  Under Signal Strength you want a value of -75 dBm or lower (lower values the better).  -76 dBm and up is bad.  Under Signal to Noise, you want a value of 25 dBm or higher (higher values the better).
For measuring signal strength I use Airmagnet but you can use Netstumbler or Cisco Wireless Site Survey.

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