Well, obviously the torque curve is dropping off too quickly.
HP = Torque(ft-lb)*rpm/5252 (Notice the curves on your graph cross at 5252 rpm)
So to get more HP you have to keep the torque up as the revs increase.
When you say BHP is down, compared to what?
Pure speculation, but I'd guess the remap isn't matched to the induction modifications. You did say you'd built your own FMIC - was the remap custom-matched to that?