This heeling maybe increasing water line lenght but at the same time it
is decreasing sail height, decreasing keel depth. decreasing rudder
depth. Probably increasing leeway

A heeled rig may still be optimal. All boats make some leeway. The original
point was about a heeled design going faster than design sailed flat. On the
P30 we observed the highest speeds on a reach with a heel factor around 15.

RB