This is my personal opinion only, those are good shafts, they are some of the most consistent shafts on the market, but for me I just could never see shooting these because of the limitations with your FOC. I like to be 14-15 % with fixed heads and that's just not possible for me in the 340 spine. I changed to the axis shaft last year and it fits exactly where I want it to be 14.6 Foc, 475 grains. With a 50 grain insert and 125 grain head. The deep six really limits your head selection, although It is growing.