Like everyone's tellin ya..... it's not the broadhead. My advice would be to go with the Muzzy because it's a simple more fail safe design. But FIRST! practice, practice, practice. Sounds like you need to have someone with some experience take a look at your setup........ could be anything from improperly spined arrows, to your rest being off center, nocking point, poor form(anchor point, draw length) or maybe a little of each.

Take your bow and arrows to your local shop and ask them to check your setup and maybe watch you shoot a few arrows.