CP Pro inverted problem.

Ok, let me just list off some characteristics about the heli, in case.

CNC Bell/Hiller Head.
Pitch seems to be good, in negative, and in positive.
Main Gear mesh is good.
Tail is still responsive.
Stock 800mah LiPo.
Standard Eflite radio / programming.

Ok, once I roll it over or flip it over in inverted, even with full negative pitch, it's having a REAL hard time getting up in the air, in fact, I can barely keep it in a hover upside down, it just wants to drop out of the sky.

It will hover about 2 feet off the ground, but I cant really get it to raise in negative pitch.

Is this just a normal reality for a Pro with a lot of hours on it, or am I hitting a problem here?

Maybe, last Wednesday, it seemed to be fine (last time I was flying inverted, was trying funnels, no crashes, no serious damage or anything).

Anyone got ideas =/?