RE: 13.3 foc could it cause problems
I'll take 15% if I can get it. I agree with everything Arthur said. I shoot arrows with high FOC's at 70 yards at fairly slow speeds (low 200 fps range) and don't have any trouble with them. I have never understood the low profile itty bitty fletchings people use, especially when shooting at relitively known distances. I want the most forgiving arrow I can shoot. That means plenty of fletching and generous FOC to me.
Paul