I have a mostly melee party with high AC and feel like that makes a lot of encounters easier than playing ranged unless you use stealth shenanigans. I'd say actually the toughest fight for me was killing the cambions in the tutorial. There I needed some cheesy gameplay, that involved a lot of shoving.
The Gith fight went well for me, probably because the AI took some very questionable decisions. (E.g. Having the rogue attack my AC18 full HP ranger instead of targeting an already injured Lae'zel, squishy Gale or Shadowheart who was concentrating on a powerful spell. Or casting silence on Lae'zel and the Ranger instead of Gale or Shadowheart). I guess once the AI becomes smarter, they might have to reduce the HP again. But in the current state it seems a fitting difficulty, considering that this will likely be the final fight before you start act 2 and you also get a lot of valuable loot.
I was struggeling with some of the underdark fights, but that was mainly a self made issue (3 party members without darkvision, forgot to have anyone pick the light or dancing lights cantrip).
