I have a smartech aerohawk and i'm having a problem with it after taleoff and hovering a few seconds it starts to wobble seems to start in pitch and gets worse it will shake itself out of the air. This it what I have done so far, balanced rotor blades, balanced flybar and paddles, checked for loose bearings broken parts all ok, checked rotor blades for equal pitch, don't think its gyro related because the tail stays still untill wobble gets really bad. Any ideas I am out of ideas.

Too tight or too loose main blades...