Drag,
Start feed them Purina Deer Chow with WeatherShield. It will surprise you. I started feed them this down here about 4 years ago, big results. You don't start to see the results till early August. 50# runs around $12 down here. Mix it 25% chow to what ever you use. If you start to see that they are feeding on other things besides your bait pile, mix 50% chow as they will still be taking in the same amount. I fed them this for two months, then stopped for two weeks then buried it about 30 yards away from bait site. They dug a whole about six foot round by two feet deep in about two days. It was the middle of March. I'll scan my pics and send them to be posted.
Till our trails cross,
Ryan
PS I will show my homemade feeder tubes, too! Better then spilling on ground.