I have been sailing the Laser Radial since March this year and have recently been sailing up to 5 days a week, which must be bad for my sail. However, vertical creases have begun to appear on my sail from the head, to the forward ends of the batten pockets in a direction down the sail. I am not sure is this is to do with excessive vang tension or whether my sail has worn out. It also seems that the roach of the sail is sometimes deflected forward on light reaches and only goes back to normal when I ease the vang to less than I would consider ideal. Overall the sail does not seem to be setting well. Has anyone else had this problem, or know what causes it? Thanks