More power usualy means more "recoil",so the consistency of how you hold the gun becomes more critical.This can be offset by adding weight to the gun,to some extent.Try to keep the added weight as close to the centerline of the piston as you can.Another factor is that often,especialy with the chinese guns,a hot one is dieseling more,which tends to cause a wider range of velocities than a gun dieseling less.On the other side,a faster pellet will drop less and be blown around less.