Greg,
I think at some point you may need to make a minor adjustment to the Andante Ab Singing C Step 2 video as a result of your findings at UNSW Acoustic’s lab. At about the 1-minute mark you talk about A440 and the lip needing to oscillate 440 times per second. My understanding from UNSW is that although the frequency is 440Hz, the lip does not need to oscillate at that rate to produce that pitch.

Nigel