Bill, you may also be pinching
Pointing too high, that is. I've found in years of racing that when I'm close hauled I personally tend to point higher than I should and have the sails pulled in all the way. I lose speed that way, so the leward slip is increased versus my forward motion - very frustrating. It took a time out with another sailor skippering that I saw him pull the boom in tight and then let it out a couple of inches to give the sail shape. He had to fall off a few degrees, but the increased speed he got from the better sail shape and very slight reach had a big effect on reducing the relative side slip versus forward motion.As with everything, your experience my differ. Not valid in all situations. Restrictions apply. Mike