Muzzy's seem to work the best for me, I had the same prob, my fieldpionts got good groups but my broad heads sucked, so I went with the Muzzy's, 3 blade 125gr, now I get 2in groups out to 45 yrds. you just have to expeiment with different things, and see what works best with your set up, like someone said, I would paper tune and see if that could be the problem. I hope you get it figured out!