I would first try changing your feed to something like Purina Layena, although it's more expensive. I've never bought Rural King feed, but I'd bet it has really cheap ingredients, like all the other feeds they sell. I personally think that some animal by-products in feed give a nasty taste. Long before I had my own hens, I had the opportunity to buy backyard eggs from my boss, but I hated the way they tasted. Then she switched feeds, and the bad taste went away. Anyone else remember the old Dumor feed, before they reformulated it? Yuck.