Simple BGC gimbal sudden movements to stabilize pitch

Hi guys,

Please check out the following video

https://drive.google.com/open?id=1CHQY34hsWtzEYnhF8EWDmWWyv_vJPU--

Camera is properly balance in pitch. With motors off, it stays in whatever pitch angle I decided. However when I turn motors and simulate pitch movements on the dron, as you can seen, the gimbal try to correct the perturbation with sudden movements.

In order to crrect this behaious, I was playing mainly with P, D a motor power for pitch (now set in 4, 2 and 210 respectively). What else would you recommend me to do? Notice that this is not happening in roll.

What other parameter should I change to try to fix this behaviour? That does not sound to me as low or high frequency oscillation. So… what parameter may be affecting this?

Thanks in advance.

JM