The Stingers are one of the sharpest broadheads out of the box, plus they feature a cut on contact tip.

I shoot Muzzy's, but I cannot get them to group with my field tips either. I just readjust the sights. I go through the extra trouble of resighting my arrows in each season because the Muzzy's are definatelly worth the extra hassle.

You also might want to consider adding the Slick Tricks.