[Daryl]

I have over 100 tour swings in my store for daily review. Ever great player moves his head 2 to 3 inches on the back swing. Brian Gay also moves his head more over the right leg on his driver.
Turning the left wrist to a parallel position when held in front of you will give you max right wrist bend.

Moving your Head during the Backswing is the easy part. Getting it back to center before it causes damage: Priceless.

I'm not a seasoned tour pro, so if I move my head during the Backswing, everything goes to crap.