I have two 3ft. trough-style feeders for my 75 birds. The problem is not only packed feeders, but the fact that my feeders empty in about 3 hours, which makes for a problem when I leave for work at 1:30 in the afternoon. I thought about a big range feeder, but with what I have now, I get 12 feet of trough space, and it seems like that would be cut WAY down with a range feeder. Any suggestions?