The head should remain down "at" contact, not "before" contact. Go get a bat & swing at some balls off a tee. Hold on with both hands & finish & try to keep your head down at contact & a bit after contact (this is what the best do, just look at some video). Now do the same thing & release the top hand "after" contact & see if it does not feel free & easy in comparison. After this experiment, read Lau's book "The Art of Hitting .300" in its entirety & then write his estate a letter telling them how faulty his logic was. You can also CC George Brett & Rod Carew.