I'd still hang stands in the inside (big and small) corners of the woodlots between the corn and the supposed bedding area. Next thing I'd do is find out where the acorns are.

That's where they'll be heading, next, I'd bet. It's pretty wide open out there. Can you watch them from a distance? They HAVE to cross a field if they'r eutilizing this area. What about early mornings? Can you sneak in and watch from a distance?