I have shot carbons fletchedwith 4" feathers,which puts my FOC in the 14% or better range.Those shafts with fixed blade heads flew PERFECT !!.
I just put some feathers on a 400 AXIS,,just to see how much helical I could geton those skinny suckers.Came out lookin real pretty

,,and with a 100 grn. T-head in the drivers seat,they come in at around 15% FOC.
I did'nt get a chance to shootthis combo yet,but I think I know how its going to do