Sorry I didn't see your post until today. I have found that Muzzy practice blades actually fly just like their thier sharp ones. Muzzys are very accurate broadheads, but the most accurate fixed blade head I have ever shot is the Slick trick broadhead. In some recent testing I have found them to be very accurate, even with straight fletching,and not so perfectly tuned bow. I don't think you will see a differnce between a slick trick and a muzzy if you have a perfectly tuned bow, with plenty of helical fletching, but with straight fletch, or smaller fletchs you will see a differnce, or at least I have. The slick tricks fly more like more like a mechanical than a fixed blade head.

TAKE YOUR KIDS HUNTING AND YOU WON'T BE HUNTING FOR YOUR KIDS