Just increase all the damage and life of mobs in acts 2 and 3. If Larian wants to be more careful, then she only increases the damage and life of bosses.
The fight with most of the bosses in act 2 and 3 is really VERY disappointing. They practically die before we even understand how their mechanics work... Imbalance causing ease generates a very serious effect of loss of immersion in the game.
Not everyone has this, just those who enjoy real challenges a little more, but we shouldn't be left aside, we are also a large part of the public.