P factor is when a plane is in a high pitch angle the descending blade has a higher angle of attack than the ascending blade.
This will make the p[lane turn to the direction of the ascending blade, usually left.
What I think you are experiencing is gyroscopic precession.
The more rotating mass you have the stronger the effect.
Pushes downward or upward will result in an attempted turn.
The guys in the aerodynamics section could possibly solve your problem.
Last edited by pd1; 06-20-2016 at 05:12 AM.
Reason: can't post after meds