After reading the epic thread about high FOC and fletching, I made up some 4x2.5 (.5" tall)fletches for my 24% FOC arrows. They have been awesome to shoot, whether in rain, wind, or whatever. Plus they are extremely quiet. I will add that so far, most of my shooting has been with field points, but the one or two hundred shots I have done with some Grizzly 160's have shown no noticeable difference. Remember the requirement for smaller fletching to adequately stabilize your arrows is high FOC, which creates a longer 'steering arm' between the fletch and the balance point of the arrow. So far so good. But I'm still learning about all this.
Dave