P2 + 2 axis gimbal with yaw vibrations?

[FedeVision]

Hi all, been trying to fix yaw vibrations on my P2v1, first used 3 axis gimbal, with no luck, now testing 2 axis gimbal and yaw vibrations still there, so started to play with P2 yaw gains, got better but not good enough, already balanced props, motors, and motors with props on. What else should I check?
Cheers.

 

[FedeVision]

This is a sample of a test I made with ND8 filter included.

http://youtu.be/hNVJaosM2fM

Any help would be appreciated, thanks.