Keeping the head still in the golf swing

[cantputt]

I tend to have a habit of slightly turning my head to look at the club going back and I am pretty sure it is affecting the consistency of my golf shot.  I developed this habit after always checking on my club position when it is parallel to the ground (as a drill).  I seem to be unable to shake this tendency now when I go up to swing and actually hit the ball.  If I focus on keeping my head down I feel like I lose the feel of the clubhead and get uneasy.  Definitely less of a problem for my shorter clubs but definitely more apparent in my longer irons/ woods.  Anyone have any tips or drills I can use to fix the habit of looking back? Any similar experience or tips are appreciated. Thanks!