I've been working on eliminating this with my coach for the past week, but having limited success. I've always had a bit of a forward/down head movement into impact (not drastic, my head stops before it gets in front of the ball) and it's limiting my ability to fully clear my hips, which then makes have to use my hands to square the face. This makes my swing highly dependent on timing.
The frustrating thing is that when I make a practice swing I can head my head at the same level, and it's all other swing flaws seem to go away (hips clear in sequence, body rotation squares face, etc.), but put a ball in front of me and it's much more difficult. When I do keep my head level throughout, I hit the ball thin 8/10 times (but the two or so I don't are big improvements and effortless distance/accuracy).
Anyone have any good drills/advice? Or is it just something where I need to trust the process and forget about results and it will work itself out?