How can I smooth out my flight?

I fly a Hobbyking Dart quadcopter with an APM 2.6 GPS flight controller.
The carbon props have been blade and hub balanced.
I have autotuned it.
The Dart quadcopter has a rubber isolated upper deck for the mobius camera to sit on.
When I fly the quad tends to wobble about quite a bit so I cannot get smooth video.
What do I need to adjust to minimise the wobble please?
Please see the onbaord video here >>

You can see the wobble from 0:55 onwards

https://www.youtube.com/watch?v=y0bfmJZHrSk&feature=youtu.be

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