You could install a trim tab on the end of the rudder as they do to the rudder of airplanes that would push the rudder right to compensate. It would have to be somewhat adjustable under water
, but it would take the pressure of the wheel
over 2000 rpm
. Set it to the RPM you want. Then it could be in fiberglass
on the trailing edge of the rudder to mimic the adjustable one, and then remove the adjustable.