Any perfered route for act 3, is there something I am doing wrong or am i supposed to be struggling this way ? Again I can usually get through the AC and/or saves of mobs if given enough time to debuff and then Regill and Woljff can generally 1 or 2 round anything down. The issue is getting to that point without losing half my team.
I start with Greengates (Demon's Heresy), I think it's the easiest area in the chapter.
Then I try to do the lab ASAP. I think you can stick to the main corridor and the already opened doors until you hit the end, then go back and explore the rest after that. If that works you'll get a power bump before the more difficult fights in the area.
I tend to leave Wintersun and Blackwater until last. Blackwater is, in particular, a bit of a slog (although having a lot of mind-effecting spells might help you on there).