At least you can get your 4 blade muzzys to fly correctly out of your bow. I was using muzzy 4 balde 100 gr on Easton 2314 aluminum arrows and could hit the broadside of a barn even ifI was inside the barn.SoI did a little research and triedthe same broadheads on my carbons whichI no longer use, again same thing, sothenI tried my Thunderehead 3 blade 100grainbroad heads on my aluminums and dead center anywhere from 15 yards to 35 yards.Put them on my carbons and again, dead center. Needless to sayI am not impressed with Muzzy products. I dont think they are bad to the bone, I thinkthey just plainout suck! I will never buy another Muzzy product. My next broad head purchase will always be NAP Thunderheads and American Broadhead. Check out this site. All you muzzy lovers think Muzzys are bad to the bone, these babies are bad all the way through the bone and then some!!!
http://www.americanbroadhead.com/cgi-bin/trophy.cgi?Status=Livewatch the videos and be prepared to buy a good stable broadhead.