Sail trim in YT video was poor because the main wasn't sheeted in enough, not because it needed a curved traveller, although the curve is nice. I'm sheeted down hard in my vid - the wrinkles are because I don't have the downhaul enough on. I am looking up at it and mentally bewailing that issue as we were sailing along... and we're both way too far back on the boat, but then I'd never really sailed the boat with another person aboard. It being a singlehander and all ;-)
My main, which is most excellent, was built by Jay Glaser when he was at Ullman, and Charlie Ogletree was kind enough to measure/weigh my boat as a service as the Ullman rep. I would now be torn in telling you whom to go for a sail, in that Ogletree is now still with Ullman and Glaser is now on his own...