Ihad the same problem and so did my dad we both got new bows this year and had them shooting dead on with field tips, then went to our thunderheads that we have always shot and they didnt fly right so we tried muzzy four bladesame thingi tried a nap crossfire same thing, so then we tried iron heads and slick tricks they flew great thats with no extra tuning from the field tips. just to see i went back and tried the others the flight was off. my uncle bought new brodheads and his flight was off from his field tips i gave him a slick trick and he hit right on there heads are great you should give them a try. Just thought i would share.