Shaggy: When you say your accurate in pratice, I take it that means with field tipped arrows. Now what kind of broadhead were you using? If it was a fixed broad head they sometimes will impact low if your setup is not tuned for them. So to try an answear your question we need to know if you tuned your bow for the type of broadhead you were using. If you didn't you need too. If you did, then its more a question of form or yardage estimate.