S900 Shaking (WKM)

After some help please...

Just fitted a new gimbal to my S900 and its shaking in flight and when the gear is raised it seems to get worse.

Previously had a Z15 on it and is smooth as silk. I adjusted the IMU and GPS Z axis which helped a little but not enough.

The COG is now lower and i was wondering if the gains needs to be adjusted??

Any ideas to try?
 

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