Good read Col
Sounds very much like my setup. My 550 still has not flown with the video stuff / gimbal / gopro on there - not had time or the weather to try it!
The Tarot 650 i'm building with a Naza Lite is VERY nice - the quality of the frame make the DJI look like a toy! I'm 'almost' considering a Tarot Hex (like Jimmy) and transplanting all my 550 Gear into it....
Hopefully get it sorted over Xmas - get some pictures up so we can see the progress
Andy