Also try other channels. My neighbor runs his AP smack-dab in the middle of the spectrum, on channel 6, so I run channel 1. Try changing the channel to see if you get an improvement.
Also check for new firmware for your AP and wireless cards. I have a Linksys PCI card in one of my machines that got a lousy connection until I updated its firmware.
BTW, I'm running DHCP on everything, and I don't see any reliability differences over static addresses. It shouldn't anyway, since all of the wireless functions occur on data link layer, which is lower level than the transport (IP).
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