Welcome to the party JackII.
Sounds like the jitter is because of the gimbal touching something, or out of balance with the camera you are using, or maybe some wires are binding. My gimbal will just about touch a flat surface with stock landing gear. I took a sheet of semi-ridged foam and cut away beneath the gimbal. Now I don't have to worry about the gimbal touching anything before takeoff. I catch for landing, when I don't crash.
Did you turn on the pitch control in NAZA?
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