First thing I'd be concerned about is your arrows. NO fixed blade broadhead is going to shoot well on crooked arrows. Contrary to popular myth, carbon arrows can go crooked after some use. They can also start showing serious spine differences. They can and do wear out. They might look okay, but even carbon arrows need to be replaced when accuracy starts going crappy.

After getting good arrows, THEN work on your bow's tune.Paper tuning will get it roughed in and the method that Butch told you about will finish it off and get it done right.