Even that simple sentence there suggests that you're bow isn't as well tuned as you say it is. I couldn't imagine a tuned rig that would really need ANY adjusting just for the Rage practice head ??? Then to state that your bow launches the actually mech b-heads 8" high from the practice heads... NO WAY! It sounds like you've obviously got a nock height adjustment issue that is causing the Rages to plane? I'd look into that and if you're still lost, consult a Pro Shop.... thats what they are there for! Good luck with your shooting?