^ That's the reason most amateurs don't have enough spine tilt using longer clubs - they figure that they're behind the ball enough because of the 'trail hand low' impression of tilting.

I'm still having to make a concious tilt to get my heart over the ball, and my ear away from it. I can feel a slight stretch in my lead obliques when I'm 'there' (but I'm 50 lbs overweight, and not terribly flexible).