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??[:@]

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read this it should help.
http://www.broadheadtests.com/TUNING.html

What negativity?????????????????? I will always use mechanicals never had a problem.
or if you are talking about what other people say about them?? if they work for you does it matter what everyone else thinks????

I don't have a thing negative to say about my mechanicals either.

However, My bow will shoot a fixed blade just as accurate.

doesn't sound like you got the bow tuned at all. follow 5shots link and learn...