While flying, autopilot engaged, press and hold the mode button. The will put you in the config mode. The first selection is roll gain/lateral activity, turn the knob to the left until roll gain is zero and then exit. My rv6 does the same thing in perfectly still air. I adjusted the roll gain to zero and when it is slightly moving the stick, i roll in a little roll trim. This takes out the dead zone in the servo. Flys like it is on rails.