Real quick heres my set up. 54# Super Kodiak shooting Carbon Express 250 at 28.5" (arrow length) with a 150 grain tip gives me 14.46 FOC and a 519 grain arrow. I shoot three fingers under, when I shoot a fletched arrow through paper I get a bullet hole a bare shaft gives me knock high. When I shoot a group at the target at about 12 yds the bare shaft hits in the same line as the fletched arrows but about 3-4" low. I have tried as high as 3/4" to as low as 1/8" but can't get the bare shaft to tune perfectly. My fletched arrows fly like darts should I screw in a broadhead and if they fly true call it quits, or is there something I'm missing. Thanks Joe