Black tape shows where original working jib track was mounted, the real thing is where it ought to be. My sail makers, Bremen Sails, took one look at the position on blueprint and said "that must be way off."

FORMULA: Find the mid-point of luff. Run a line from it through the clew to the deck. This point is where track should be. The sail trims perfectly with this placement. You can see why it IS possible and efficient to lead the sheet forward of both shrouds while going to windward.