Hello, I have one of those two door metal feeders and my hogs are eating too much. I have three 5 month old Hertford hogs on about two acres of rotating pasture, and they will still drain all 100lbs of feed out of that thing in about two in half days. (I believe that is too much feed). The gap at the bottom is about 2" so I'm thinking about closing it up a bit with something. How does everyone else address this problem?