If you normally use a higher grip, with the webbing of the hand and base of thumb in the throat of the grip taking the pressure, then "heeling" the grip as you shoot will cause you to shoot high. A high grip on the bow can prevent this, and though I shoot with a "high" grip, I can't stand a high grip on a bow, as I find it too restrictive, too "tight." There is nothing wrong with shooting with a low, or heel pressure, grip, as long as you do it all the time. I am super sensitive to grip design; if the grip doesn't feel right, I can't shoot that bow well.