I have finally got my alexmos 2 axis gimbal working with RC settings for pitch the camera (GoPro) is stabilised very well, however if there is a knock or if I move the gimbal forward >50° then the camera will continue moving backwards until it bounces against the roll motor.

What do you think the problem is?

Tried:
Acc_Cal
Gyro_Cal
Changing axis_top & axis_right

Edit: I also have a video of the problem of that helps.