Hulk you have done yourself no favours with your comments.
a problem with this board in tricopter mode - fact.
There is a solution for the problem - low pass filter code in firmware (Mr kk has acknowledged and is fixing)
This same problem occured with the origional kk board using tricopter firmware and again a low pass filter was added in V1.5 / 1.6 firmware to fix it, see here
-Added a low pass filter on the output to remove the vibration induced servo jitter.
-Also doubled the arming/disarming time to make accidental arming/disarming less likely to happen."
Now off to the naughty step Mr Hulk