In both plain vanilla and VP modpack versions A6M QM missions start with ball indicator right of center. External view also shows rudder deviated to right. Rudder trim control does not seem to aid in centering the ball indicator. Subjectively, constant pressure on right rudder pedal to keep the ball indicator centered seems to have beneficial effect on airspeed that I am reluctant to attribute to placebo effect. A brief google search has not produced any relevant results. Pointers to any resource re this issue would be appreciated.