Isnt Larian doing the proper bigger harder mod, as they recently announced? That will inculde redesigned encounters and other tweaks... so probably refining Ai too since its a part of that process anyway.
And if it is refined i would like to point out that some enemies need to be made dumber.
For example, headless zombies should charge through any elemental damage, instead of avoiding it like everyone else - since they dont have any heads to get all that. They are brainless.