Rich, your comment about the C2 mast doesn't make any sense. Yes they've broke some but so have all the manufacturers.
I've sailed my infusion, wildcat, and c2 downwind without it all the way off. Sometimes it absolutely makes sense not to rotate it to 90 or past. I've found there are certain conditions where I've felt it's faster to leave it pointed around the shrouds. I would not to that in heavy air though, not worth the risk over whatever slight reward there may be.