If i may add that yes easton recomends 9-12% foc my arrows 2314xx78ss 100grain tip and 5" feathers seems to land me about 7-8% foc the only time even notice anything in flight differnce is the thunderhead hits about 2" lowwer at 35 yards then the feild points. which makes sence as thunder head is longer and pushes foc futher forward.
thanks