okay, so it takes ~60ms to grab a frame. My servo's have a refresh rate of 50Hz, that is 20ms between movements. Its surprising then that we count so many jello waves when theoretically, the servo could only move 3x per frame.
I replaced the bad servo and stiffened up the bracket with some carbon and expoxy, and did some more ground testing to make sure it is indeed the servo and not something else. This is with the gimbal turned off:
motion blur, but no jello.
This is with the gimbal (now no longer properly configured as the servo's are different) turned on:
there is clear jello, although I dont think its anywhere near the 10-15 lines we saw in the aerial stills. So there may be a secondary effect playing as well.