We have the same situation on our property in Northern Kentucky where I live. In the summer there is a group of 6 bucks that is always together and they go anywhere from 140-170". But come the season you may only see one or two of them, and getting a shot is lucky. So this year we used one of our cedar thickets and did what duke and GMMAT suggested and cut prolly half of those down and let them lay. Then cut half of the rest remaining half way down (so there still living, I believe its called "hinge cutting"). and just after one season we began to see these bigger and more mature deer more frequently.

But come the rifle season its like the big boys found an underground hiding spot due to all the neighboring preasure, but they are still here and they are back in their bachelor group for the winter and are slowly becoming more visible........

I would suggest to atleast try what we have said. To me it just gives them a sense of security in these areas. Good luck (sorry for being so long)