RE: Fletching effect on fps?
I believe I have the 6 degree helical. I love the easy fletching with it. I bought it when I was shooting aluminums and now wonder if they make a special one for the ics carbons-it just seems like it could be a little tighter when i clmp down.
Anyway the helical it puts on my carbons makes shooting through a shoot through rest hard to do without getting dome fletching contact. I solved this on my mathews by adding a whisker bisquit.
As far as fps goes. when I shoot a stright fletched arrow through my chrony followed by a helical fletched there is always at least a 2fps drop in speed with the helical. This might be due to some extra drag when the helical is trying to get through the bisquit.
Good luck with your decision.
P.s I could get just as good of groups with the straight fletched muzzy tipped arrows as I could the helical fletched arrow. Sub 2" at 30 yards (thats as far as I'll shoot so thats as far as I tested)