It may in fact be a ham that is legally operating in the 2.4GHz band. Hams are licensed users of this spectrum, and have priority. They could be causing the interference (if in fact they are),
and if so you just have to live with it, if it can't be resolved. Hams are also protected from interference (by law) from the unlicensed users of the spectrum.
And by the way, end users increasing the power output of a WiFi transmitter is not a good idea. It can cause interference on nearby spectrum, and increased noise levels in the band, which can defeat the purpose of the increase in the first place. This is not something that should be hacked.