I'm don't know your set up or speed you are shooting, but if you are shooting at speeds in excess of 250fps larger broadheads have a tendency of planing. Just a thought as the hellrazor has a much bigger blade than a muzzy. If you are shooting at blazing speeds you will not be able to shoot a large broadhead, that is why the smaller broadheads are so popular this day and age. If you are not shooting really fast you probably just need to do some fine tuning with your set up. Just my take. good luck and happy hunting.