The main is near 2yr old and starting to develop a hooked leech in the top half of the sail now the material is loosening up a bit, there's a hollow cut in up there. I've tried all sorts of adjustments, top up boom a bit & slack of gaff, tightened gaff lashing mid length and loosen peak lashing, replaced luff lashing with hoops to maintain constant luff shape. The leech line is free. I propose to unpick the leech line pocket/ hem and test sail and if that doesn't open the leech up I will open the broad seam. Am I barking up the right tree ?