TN--I went through the same issue as you last year except the place I hunt really has no crop fields. It was just that we had so many dang oak trees dropping...the forest floor is still covered in them this year. I saw less deer last year than in the previous 14 years of hunting. I could barely pattern anything deep in the woods.

The one thing that I did feel helped me was trying to pattern which oaks they were using based on their bedding areas. It was very hot last year and the deer barely moved in the early season, hence they mostly ate right close to their bedding areas (50-100 yards). As the season progressed, they began to move a little better because they had eaten up their primary food source close to their beds....and I just tried to adjust each hunt. Eventually it paid off in a deer that was feeding on a secondary site that was around 200 yards from their beds on an oak flat. It took me 3.5 weeks to get on a deer last year and loose an arrow. He was eating close to security cover.