as you shoot more deer you will realize, even the best aimed arrow is not totally in your controll,, the deer will probably move and it can change the results dramtically, you have to take your best shot and hope for the best,, deer can sometimes go further than expected with either shot,, or any shot,, I think low in the vitals has worked best for me, and seems better for a blood trail than a high shot,,
that being said, even a gut shot is deadly,, etc etc, My friend Jerry Simmons who invented the Simmons head, shot a heavier bow and took whatever shot the deer presented,, with hundreds of deer kills,,he was deadly, and told me I should never miss a deer,, it was so much bigger than a rabbit,,:)