know it or not you're WAY ahead of the game, at least you have them coming into shooting range, now all you need is to be patient and take some time to study the deer you'll be able to tell when its time to draw back without spooking them, maybe even let them pass by if thats what it takes.
you might even want to try drawing back early, it's a timing thing you may have to hold full draw for a minute or two but again this is something that takes practice.
Hope that makes sense, good luck to you.
Democracy is two wolves and a lamb voting on what to have for lunch.
Liberty is a well-armed lamb contesting the outcome of the vote.