I believe it has something to do with all the injuries he has had recently. Not that he is not recovered from these injuries. But I think each injury(Ab,shoulder, and back) have all taken there toll on his delivery sequence. When he is going good he is extremly smooth to the plate. When he is off, like he has been recently, he gets all little herky jerky, too far over the top of staying back too long. He will find it eventually.