I'm running a FC40 with a 2 Axis gimbal and I constantly run into slight vibrations (it looks like it goes left and right very slightly) in the video. I do fly on pretty windy days, so I know that cant help, but it also seems like there are vibrations even on non windy days. I always fly with GPS and I'm starting to think it's GPS that might be causing the issue. Maybe all the little corrections it makes? Should I run ATTI mode when doing video? Or do I need to calibrate the phantom, even though the naza assistant says its not needed?