RTS threshold, fragmentation, and other advanced WiFi settings

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http://serverfault.com – Background: I'm in a noisy environment, and I'm trying to optimize my WiFi network to have a more stable connection for the somewhat high volume of users (~50-75 on a busy day). There are 4 APs, and I've already adjusted the channels and transmit power, and overall I have fairly decent coverage. However, I still get about ~10% packet drop when pinging Google and walking around the building, roaming from AP to AP. In most WiFi APs I've seen, the default RTS Threshold is set at 2347 (from what I've read in various places, this setting counts as "disabled"), and Fragmentation Threshold is set at (HowTos)