Phantom seemed to hold rock steady in yaw to the extent that sometimes it seemed like the video was "hung" it was so rock solid. For Inspire, I am noticing yaw drift sufficient that I have to do small corrections to maintain heading. Thought this might be gimbal at first, but with a few more flights it seems to be the craft rotating slightly and slowly. It seems to do it more with greater wind. How is the rotational stability of your bird? If you fly up to 100ft and let go of the sticks with a tree or something at the edge of the frame, do you see this moving (leaving or entering the frame)?