You should take this, the longest gap between posts, as Good News!
This means that things are going very well in the world of smooth, floating, under-hip landing running.
My strategy of strictly restricting runs to 20 to 25 mins, at no faster than 4:30/km (ish), but increasing frequency to every day, has really paid off. I feel that the new posture is becoming automatic. And this is giving me the opportunity to get the feel for micro-adjustments. For example the balancing-exercises that Keith suggested two weeks ago (heels higher/lower, knee lift) and also concentrating on relaxing shoulders.
In fact, the only part of my body that aches now is my neck! Clearly I'm consciously and artificially holding it back, or trying to pull my shoulders back, or something - probably in the quest for getting the head, hips, and landing-foot in alignment. So I'm now working on relaxing the shoulders, letting them drop, and thinking more about not bending forward at the waist.
I'll let you know if it works!
Oh, and I won't pretend that I'm not just a little bit excited that Keith and Heidi are working on the second edition of the book as we speak!!