Bumping this great thread with my results that are finally here.
Despite what most people advised, i ended up buying a 3071 with the genuine Garrett .82 rear
I absolutely love it; full boost (17psi) by 3600rpm and makes 280rwkw. If i did get the 3076 i still think i'd struggle to make 300 with internal gate. (I firmly did not want to run ext gate)