Vic it doesn't matter
Rule of thumb (even above 13-14 knots) assume weather helm = slow
depower the rig to achieve no or reduce load on helm.
check it out with your speedo or with one of your tune up partners
While your modified rudder is nice for reducing load on the helm, better for cruising perhaps, for racing, the original rudder design will tell you when to de-power, you can drive by feel