Wireless bridging with 1242AP

I've got two cisco 1242 access points both with the same IOS, one is configured as a workgroup bridge and it connects to the other 1242 which is configured as an access point. I'm getting poor data speed between the two. I remember reading somewhere that bridging is done at reduced power on the 1242, is this why the data speed is poor? I get about 2mb/sec between the two. I know antennas and distance come into it but I've tried several different combinations but the most I get is about 2mb/sec. Are there any know settings that increase performance with bridging?
My second question is: is there any difference in performance with these ap's when used with an air-pwrinj or a normal DC adaptor?

I did the checks as you say but no errors were present, all ports - router and wgb and ap - were all full duplex 100mbs, bvi ports on wb and ap showed no errors. MTU on all ports was 1500. One thing I did see was a setting for best throughput so I dotted that in both devices and the speed increased to 3.5Mb/sec. As a further test I got a wireless pc and connected it to the ap and did a file transfer exactly as before but I only got 2.5Mb/sec from the pc, which normally gives 12Mbs through an ethernet cable, this made me suspect the ap. The pc has a v strong wireless card connected to a big antenna so the signal was excellent. So then I got the wb, reconfigured it as an ap and did the same thing through that and got exactly the same results, so both devices perform the same. I also tried connecting a pc straight to the wb (not through the router) but it made no difference. I think I've tried nearly variation I can but I'm getting the impression this is the best I'm can get out of these 1242's, unless there's a magical setting I've missed...

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Instead directly connect the wireless interface to the bridge device,
You could use iptables to forward and NAT traffic between wlan0 and br0
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