Had another try with this setup - I swopped the tilt servo to the other side so I can get the Go Pro lens centered and I added my ebay special vibration dampening plate. Overall quite chuffed as the video looks really quite decent, still a bit of vibration now and then, but overall very happy for now. Not bad considering it all cost very little.
Carbon Props are en-route, so once balanced, they should help too.
Piccy of gimbal now mounted on anti vibration plate.
Only thing is on my 3S 2650 lipo i'm only getting around 8 mins flight time now with all the extra weight
Not sure what lipo would be best as bigger = heavier and all that - any suggestions chaps?