So, you're saying sometimes they do, and sometimes they don't. That means inconsistency to me.It sounds like you've got some issues elsewhere. Because they should eithershoot the same all the time, or not shoot the same all of the time. JMHO

I am a stickler for nothing but perfect arrow flight and do not settle for having to move pins to sight in broadheads. I never had inconsistant flight with their heads and real blades. I started finding that I would get some heads not flying right with practice blades...but would fly perfect when real blades were put in.

I am just saying that before someone gets in a panic cause they are not getting their Muzzy's to fly right, you might want to shoot them with real blades too.