I have a Legacy as well and shoot the GK Mirage rest. I've found that once my bow was properly tuned that it shoots broadheads about as good as the field/mechanical tips. At 45 yards my field tips group about 3" while the braodheads group about 5". Both hit right on or near my aiming point. At closer yardage things tighten up even more. My advice to you is to check your setup for proper tuning, then check your arrows for spine and shoot at least 4" feathers/vanes. Spinning your arrows helps as well to make sure everything is straight. This should fix your problem. Remember though, most likely broadheads will never shoot as well as fields, is just a matter of aerodynamics. Good Luck