David Duval doesn't do it. Annika Sorenstam doesn't do it. Both have been or are the #1 golfers in the world. What don't they do? "Keep their head down." Both Annika and David have a very pronounced head turn at impact, following the ball down the target line.
What began as a training tool for Annika was incorporated into her swing. She found that it eliminated her tendency to "hang back" and finish in the reverse C position. If you have trouble shifting your weight forward through the ball, try to swing like Annika: let your shoulders pull your head around as if you're following the ball as it leaves your clubface. Finish with your weight forward and standing tall, watching the ball head straight.