does yours tilt full down? The one i bought of off ebay for about 150, similar model to yours, does not go full down. If down was 0 and straight ahead was 90 degrees, it might get down to about 20 degrees then goes into the jerky head bob motion. I had to go into the NAZA and fine tune my x1 limitations so that it would go as far as it could go without activating the head bob when i turned my tilt lever all the way.
But the stupid thing is, it will tilt all the way up. Why is their any point of tilting that far up just to see the undercarriage of the phantom? It's like they installed the motors backwards.