I would definitely try to put down some minerals, whether you use a mineral block or powdered minerals. Either way once you get it set up I would pour some of your usual acorn/beet crush over top of it. You already know they like that, so once that is all gone they should realize the other minerals are down and continue to come back for them. And just periodically dump some more crush over it, especially when you plan on hunting it. Have you tried some good ole shelled corn? I've been putting it out since spring and they are eating it up every night, watched a 10 come across the bean field tonight at 8:40 and munch on it until after dark. Corn is also a whole lot cheaper than the crush too.