I'm actually struggling with the same thing. My neck tilts down and away from the target.
I spent about an hour looking at Tour swings and legendary swings and the head doesn't really stay stationary, but it comes really close.
From the face on view, if you draw a circle around a Tour players head at address, it usually has part of the head leave the circle in the backswing, most likely due to the shoulder turn. But on the downswing the head returns to the circle and stays there until about the right arm is parallel to the ground on the follow thru. So it's not exactly stationary, but pretty close.
My head goes outside the circle at about the halfway down and stays out of the circle. It's funny because I still have tape from this year when I was hitting the ball probably the best I've ever hit it and my head was staying in the circle on the downswing.
I think it's probably a bit to do with either:
1. Knee Action
2. Closed Clubface
3. Repeating a Bad Habit.
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