Jim, I never center the traveler unless I am right on the wind, even then I fear hooking my leach so I travel out slightly to if I see my one telltale on the leech acting up (Wally Myers suggested that and in light winds it sometimes does). I trim my lower telltales with the traveler and my uppers with my main sheet being absolutely sure never to stall. Then I set my jib to maintain the correct slot. Downwind I set my sails to maintain an apparent wind of 90 degrees.