Hey, that's a great site, 5shot! [8D]

Anyway, zak123, I would suggest trying different Stingers in different arrows. In other words, switch the broadheads around with a bunch of different arrows, and see if ANY of the arrows fly straight. It does sound like the inserts are not properly aligned, or that the Magnus Stingers are not exactly right for the type of arrow you are shooting.

I shoot 125gr Thunderheads out of Easton XX75 #2315's. The way my bow is setup and the way my arrows are setup, it doesn't matter.... 125gr field tips..... BAM! Bullseye at 30 yards - repeatedly. 1" groups. 125gr Thunderheads.... same thing. Bullseye at 30 yards. The Thunderheads hit the exact same spot my 125gr field tip just did.

Good luck!

Butch A.