Leech tell tales are the best when you're winning. However, the majority of us don't win.... So if I were you I would concentrate on the more important things first. ie starts, clear wind, boat handling, Then look at exact /precise tunning!!!
What's the point of having near perfect sail shape if you can't start on time, tack, gybe or mark round smoothly.
I'm sorry if I'm coming across a bit shirty but lets be fair you've got to pick up a feel for the overall boat not just pick at certain areas. What I'm trying to say (after a few drinks) is that it's a matter of feel for the WHOLE boat. Sailing is after all a form of mental masturbation.
