The FFF and the Flemish dacron stretch quite a bit, w/ the FFF being the front runner in that dept. If you haven't adj it at all yet, try putting twists in it until its about a quarter inch ABOVE the high mark, let it set over night and then shoot a dozen or so, it will settle in sooner or later. As long as it's between the two scribe marks, you're ok. you can tie the loops together to prevent it from unwinding and break a second string in, that way if you need to change one in the field you already have the dirty work done, lol. Enjoy!!