phil.samways,
Have you found any good diagrams or pictures to help get the head position corrected?
Let me know if you . . . I need the same for waltz. I have the posture, the proper footwork, very graceful, yet strong hands, but the head "sucks."
I sart off with it cocked and lifted properly, looking at the corner where the ceiling meets an adjoining wall, but two "1-2-3s" later I forget the head.
I too, am an engineer, and understand where you are coming from. We are very "visual." I am almost at the point of making a brace similar to the one in the movie where the Oriental young man desparately wanted to learn to waltz - yes, I forget the name of it! I'm sure you have seen it!
But, let me know if you discover anything, and I'll do the same for you if I do.