I only use ff now. It does stretch a little bit for the first little while, then it is good. I leave my glass recurve strung all the time, and after a month it dropped about 1/2" in brace. I make my flemish loops with lots of weave, they never slip. I do a double loop, no timber hitch. Takes a bit of fooling around to come up with a system for accurate string length. No need to make an endless loop!