I've been pulling my remaining hairs out for a while now, and I can't figure this out.
Here is a video of the issue (at the very end): https://drive.google.com/file/d/0B0LPDy0y3KwZTUpoSkpDNjdydFk/view?usp=sharing
I'm pulling data (pitch and roll) via serial out of a Razor IMU, feeding that into a mega2560 in order to control 2 servos that will compensate for the pitch/roll of the IMU that would be attached to the chassis. My circuit currently looks like this:
1k uF cap on the source (5.25v @ 300 mA) 10k resisters on the control lines for each servo which helped the twitching a little, but its still quite bad.