What we were trying to do was replicate the effect of a shelf foot main with
the flattening zipper zipped up (although my sail didn't have one). I'm not
likely to go fiddling with outhauls to just got .05% extra speed downwind
while cruising. I want a set and forget main except for the cunningham and
reefing. A little more halyard tension when setting on brisk days and a
little less on mild ones is about the extent that I want to fool with it.
When you aren't racing, the first 97% of the speed comes free as long as
your basic sail trim is right.

Clearly a mistake was made. I'll get some pictures today and go up and see
the sailmaker tomorrow.

--
Roger Long