I have 4 11month old Hens that I recently changed their feed. I was feeding Chick starter with Oyster shells and then switched to a non GMO Layer crumble. They waste more food than they eat. Most of the food is thrown to the floor of the run. I have tested by filling two feeders and placed at each end of the run and the new food always gets emptied and spread about. I have even tried to move feeders and they don't seem to like the new food. Any ideas?