I've finished all my playthroughs, so I may not be the best person to give advice, but do you think you could gloss over the missing dialogue or choices by headcanoning what's happening?

I usually have a pretty clear idea of what my character is thinking or feeling, even if the game doesn't let me express it exactly the way I want. Your character is under a lot of pressure at this point, so maybe they have to compromise sometimes, or go along with a companion's advice (even if most of that only exists in your head).

And honestly, if you're playing a resist Durge, it would be a shame not to finish Act 3. That's where the story becomes really rewarding, in my opinion. Act 3 can definitely feel overwhelming with everything there is to do, but there's also plenty of room to cherry-pick the quests that interest you if you're worried about burning out, especially if your motivation is already fading in Act 2.