Do not use the autotune engine function and set the tilt resistance manually to anywhere between 8-25. If it is too light it can shake- and sometime if it is too heavy.
This seems to happen a lot with lighter cameras. Just ignore autotuning and do all balancing manually- including the engine resistance. It also happens when center of gravity gets too high up. The shaking seems to be almost like a feedback loop- and should be possible to patch away in the future and be replaced by an audio beep and engine shutdown. *wink wink DJI devs*