Adrian, when I went to Del Warren's clinic last October, I was contemplating a change to 14 LBS and I figured I would ask him what difference it would make. His answer? Zip. Nada. Nothing. No loss of hitting or carrying power because of the aggressive nature of modern cores and coverstocks. Del felt that if you were throwing 16 lbs, you were basically lugging around an extra pound for nothing, but if you just felt more comfortable with it, so be it. I've been throwing 14s ever since, and I haven't noticed any difference from the 15s.