Sounds like a pretty good set-up. 80 acres of good habitat should support 7-8 deer, though do not be suprised if its a bit more. That number equates to just over 40 deer per square mile. You can be sure that at least one mature buck will be dominate in your area, but will cover about 1000 acres, meaning he's only on your land part time. Hunting pressure, does, and cover will dictate how often.

Young bucks, disperse mostly in the fall, so you probably see 1-1/2 yr olds passing through, often - giving the impression that all you have are young bucks. For attracting older bucks during the hunting season, cover is the KEY. Your standing corn is an excellent step in the right direction.

I'm not sure where you are, but often, early season bowhunting, is the best chance you'll have at a big buck. When one is harvested, another will quickly take its place - in the pecking order.