Re: shooting from elevated position ??
Like everyone else has said, you should be aiming for where you want the bolt to EXIT. If I have a deer standing broadside to me at say 15 yards, facing to my left, I am aimning for his RIGHT shoulder, about 1/3 the way up from the bottom of his chest, where I want the arrow to come out at. That way, you cross through more vital organs and don't risk hitting too high or too low.
Big Al's "Take-Em" Style Silhouette Decoys Pro-Staff.