what weight are you using? do you know your arrow weight? bow draw weight? draw length/arrow length etc...?
You may want to try a few different styles, ie 3 blade, 4blad, 2 blade, if you've only tested 2 similar 3blade styles, may not be helpin ya much.
It's nice to have a BH fly like a fieldtip, but if not, just tune your setup for BH's, my muzzys use to fly 3-6" high I think at 30yds.
Can always give Rage 2 blades a try...
NAP razorbaks are pretty sweet too.
maybe give a 1 piece BH a try if you're set on fixed...such as a montec g3 etc...