correcting autopilot overshoot

My boat consistently (even with the latest s/w update) has an overshoot of 35+ degrees before correcting to the set course. The manual says to adjust rudder gain, however, this is not an available option for the evolution. What do you recommend?

Autopilot and related equipment list:
EVOLUTION EV1 SENSOR CORE E70096
ACU-200
P70 COLOUR A/P HEAD: SAIL E22166
RAYPILOT TYP 1
MFD e95 E70021

Thanks.

-Bob.