With how far in development the game probably is, there's not time to rebalance it.
I see ... Well, my personal feeling is that time is not the problem here, but i agree that game should not be rebalanced whole ... That is why i (and few other people) supported the idea that Larian should simply allow us to add two more party members in settings, and warn us that this toggle will make game conciderably easier, and unballanced.
That way no additional balancing is needed (nor even desired sometimes ... since i actualy can imagine some people toggling this on just for Gith encounter) ...
And as i said countless times before ... everyone should be happy. ^_^