I have never seen a target at 80 yards move. Not one inch. But a deer can duck you at 10 yards. With shooting long distances as much as you obviously have, you know how long it takes your arrow to get there at those distances. A deer can move quite a bit at 70 yards. I don't see how this can be considered an ethical shot. I am not trying to jump on you by any means, but surely you understand that a deer is not a target.