I see you are not setting shaders and setting I and TC.. but wasnt it told this version will set TC automatically and also set Intensity according to shaders?
Perhaps i was not clear enough: automatic TC calculation is only performed if no TC is set. Manual tuning is always the best (and then no automatic TC calculation is performed)
And for R9 280x cards, the new calculcation is the same as the old one. Only for cards with <> 2048 shaders the behaviour differs.