About "screaming" signals. Theoretically it is a solid reasoning. But actually -- it is not.
Idea is that unnecessary high signal will create interference to neighbors. Actually it is not really the case. In practice neighbor networks usually have levels -70 -- -80 dbm, often -- even higher, so if your AP power is lowered for 6 db, it is still much over sensitivity level, and you'll get same interference. So in such environment the only question is how many free airtime is there, as all devices on same channel share same airtime. When AP power is higher, data download happens much faster (because higher modulation is used), so it takes less time, which gives more room for all other clients. On power used by clients (by far bigger number than APs) you have no control whatever anyway.
So in real life lowering AP power almost never improves things, except some specific situations. Changing channels may have much higher impact.
This is actually correct for all vendors, but especially for Ruckus, because of Ruckus Beamflex which improves signal in client direction and makes transmitted signal levels much lower for other directions.
