I know it doesn't help the question ur asking but WiFi is awful for gaming, everything can interfere with a WiFi connection and how many ppl are on it matters as well
Wireless N has less interface only cause not everything runs on that frequency
Wired is best for gaming and even then you'll notice lag on certain games when someone else connection sucks
The way most FPS that I've played at least work is ppl with good connections balance the ppl with awful ones lol
Back when Xbox live was what I played on my connection was so nice me joining laggy games would cause it to stop lagging, if me joining didn't fix it the person either had worthless internet or they were from like Brazil
To answer your other question no I don't believe you can change things to make WiFi weaker, most WiFi devices don't allow you to adjust the antenna power which is how you would boost the boost or shorten it
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