Well, guys, I'm thinking of maybe going with 4 fletch, since when I do a 3 fletch, I custom set the nock angle to mate the hen feathers to my bow shelf for a smooth pass, and a 4 fletch will allow me to use a similar strategy.
Since my fletchings are normally 6 inches long and parabolic, then using 4-fletch uncut (or minimally cut) ought to provide plenty of braking power? So, rather than stenciling out a parabolic shape, I will just leave them at full height.
4-fletched, 6 inch long, full height feathers seems like plenty of material to slow down from a 69# bow, unless someone knows something I don't...I guess I'll give it a try. But I someone knows this won't work, please tell me.