I've been shooting a PSE Durango, shooting easton XX75 2315 arrows with 125gr tips. But the only broadheads that seem to keep a tight pattern are spitfires. I want to try using muzzy but my patterns won't hold consistant with practice tips they seem to drop about 6-9 inches left to right? I've also tried Wasp and NAP fixed broadhead but I get the same awful pattern difference?? Can anyone help or explain why! Or should I just keep using the spitfires although all the negaitvity that comes with mechanicals??[:@]