This discussion is happening on every platform discussing BG3. The game's highest difficulty is insanely easy compared to other games in the genre. You honestly don't need to balance it, other than fixing the clearly bugged things like Tavern Brawler and Blade pact Extra Attack stacking, lightning charges (I could go on). Instead, add more difficulty options and address the AI having no idea how to deal with spells like Darkness (currently they'll often just stand there and let you shoot them).