Here are the benchmark settings as recommended by Pease and Jay Glaser when they produced "Danger Sails". Light air=less than 10 knots-leads set two holes forward of track center and set 9" inboard of inside of deck. Medium air=11-16 knots-leads are set at center of track and 9"-5" inboard. Heavy air=17+ set the leads two holes aft of track center and pull all the way out to the deck shear. In my own experience with both the standard jib and the MX configuration I found that jib lead settings for the standard blade jib were more dependant on the shape of the sail (blown out vs new). I can't tell you how many times I bruised my shins on those damn connecting wires. I hope this helps. Greg