Maybe he's such a large man that it gives the illusion that his strike zone is gigantic, but you're absolutely right. He gets screwed with consistency.
Zobrist has been reliable in the OF, but for some reason he always scares me when he's tracking a flyball. He just doesn't look comfortable (though I am sure he actually is).
For a while I thought it was nibbling, but the longer it has gone on, it has become obvious it's a control problem. He pretty much admitted as much himself.