We had Bebop's keel faired to start with 20 years ago, then faired keel and rudder to templates about 1990 with area added to leading edge and not much lead coming off. It was refaired a few years back when the gel coat blisters were replaced with epoxy. People tell me it is very close to the templates but I have never measured. In my estimation, there was never any noticeable performance improvement in speed or point over a basic well-faired bottom. Fresh sails, rig tune, and a clean start seem to be a much bigger factor.