RCAV8T0R - did you do anything with the "cupped" elevator? If not, think about a bit of heat and a very gentle NUDGE toward flat/level. Hair dryer heat, not heat gun. Too much heat and you will "gator" the skin. Mine is great except for inverted which requires some opposite elevator input, which tells me I need a bit more elevator correction. I see no need to shim my motor mounts .... yet, I think!
I really like the way mine is flying. Send me your email address and I'll send you a short video of that formation takeoff.
revoke - I didn't really want to do too much with this cheapie, sooooo I just pulled the throttle trim down a bit and the jumping/stuttering/cogging went away. I HATE trying to hear the tones for ESC programming! A beep sounds the same as a "tone" or "note". Jeeeez, getting old sucks ... uhm sometimes.