What type of radio are you using? I had some issues for awhile while using an m11x. I was always told back in the day to ramp the throttle epa all the way to 140%, and then start the esc setup. This caused an issue as the esc couldnt find the neutral setting. The esc would stutter under hard acceleration and sometimes would not even allow any throttle inputs. After numerous emails to AE we figured this out. The throttle epa must be set at 100% before starting the setup procedure. Not saying this is your issue but its worth a shot.