If I remember correctly, you have some unhuntable township or park land by you as well, correct? With that many acres, as he shoots does and you do your thing more will move in from the other property. It's still going to be a time consuming process, but as the displacement and continuous culling occur you should start to see improvement. If he can continue to get that permit and kill does throughout the year your job will be a lot easier.

That's great news for you. You should have a nice honey hole in a couple of years.