Pac, the way I learned it, if you're nock right it's a bit stiff. At 15 yards, though, I doubt it's enough to worry about. I bare shaft tune at close range, 5-10 yards, and when the bare shafts average straight over several shots, but a fuzz nock high, I'm there. I don't think it's necessary to the accuracy of fletched arrows, including broadheads, to try to fine tune it any further. There's a point of diminishing returns, as the accountants would say. Your arrows will shoot straight, even when you get rid of those vanes and have rain-plastered feathers.