Ummmmm can we have the bow so we can inspect how in tune it is? I mean with any broadhead they wont fly correctly unless your bow is tuned properly. To blame this on the broadhead is unfair, because it could actually be the bow. Now I'm not saying it IS, but its possible.

Check and see if your bow is properly tuned then go back and try the head.

BTW, switching from a 75 grain tip to a 100 grain tip makes a bigger difference than you would think.