Oh but there is my friend.. wireless will only allow like 50% of what a wired connection will allow.. and although it may SEEM the same.. try timing a DL of a game demo.. try once wired, and once wireless.. the difference for me was about 7 min on the same file.. and i too have 100% signal and sit less then 4 feet away from router...
As for chili .. i think that trying to set everything up while plugged in will help, if you need wireless after you are set up then so be it.. but you will ALWAYS have better speeds wired then wireless. Chili if your still having troubles you can PM me your number and i can offer what ideas i have..