Pendulum effect when doing piroetting moves

On my oxy 5 I have noticed what can only be described as a pendulum effect via elevator axis while doing pirouetting moves, particularly piro flips and pogos. I can sort of hide it by making corrections however I have other helis that do this seamlessly. Is there something I can use to try and tune this out? BK 7002 cyclic servos, torq rudder, scorpion 4025-1100kv, Hobbywing 100a esc, rail 556 main blades and 96mm tail blades, vbar neo vlink with vcontrol touch

The first Idea is the CG. If load changes, it seems there is some momentum on Elevator. Try different positions of the CG, even if its slightly apart from the mechanically ideal CG.
To make it less visible, it can help reducing the Style parameter.

so long ... Uli
http://www.vstabi.de

I will fool with the CG, as for style im already running 45