Your bow may needed tuned, put them on a spinner and see if your Muzzy broadheads are stright.
I shoot them out of 65Lbs Black Ice, axis 400 28 3/4 inch with a 85 gr. thunderhead and they shoot great, My broadheads group right with my field points, one pin good for 10 to 30 yards and I can shoot nock off out to 30 yards