[Jeff]

HB - you asked-: "So, for a given degree of axis tilt, you think it is more healthy to move your head back than your hips forward?"

Are you talking about the address position or impact position?

I think that the outer border of the left pelvis should never get outside the outer border of the left foot at impact.

I think that if one positions the outer border of the left pelvis just inside the left foot at address (by shifting the pelvis slightly leftwards at address), then one can adopt an anticipated impact alignment position with the desired degree of axis tilt that one wants to achieve at impact. Then one should keep one's head in that position at address and start from there - keeping the head stationary throughout the remainder of the swing. For irons, the head will likely end up being in the center of the stance and for a driver just right-of-center - if one adopts that practice-pattern.

Jeff.