is it better to aim it at the tip of the head instead of the center?
you mean like the center of the head or like the center of the agent? if you meant the center of the agent then of course aiming at the tip of the head is much better, but if you meant the center of the head then center of the head is definitely the better ones, so there's like a room for error for ur aim (but who tf conciously aiming at the tip of the head anyway?)