I'm using an unusual stat-rolling method, geared to ensure high stats, but not ideal distributions. While I have scaled everything up, this is mostly because I am running a 6-player game.
I don't think a superior point-buy is enough to require scaling, and if you do feel the need, I'd suggest against using the same method for every encounter. Try scaling through power, numbers, situation, etc. Sometimes letting an enemy engage under their preferred circumstance is all it takes