Thanks Greg! I appreciate the encouragement so much!
Just to share a quick discovery. I am trying to improve my jazz skills so started using the blues scales. I have found that the minor third interval is a perfect ‘sweet spot’ for feeling the embouchure changes that I am trying to implement. I can Really Feel and play with the aperture and tongue position to hone that change much better than using the harmonic intervals of open, 1-3 etc. which is a much larger jump making me want to ‘punch’ my gut to reach them.
Minor Third Long Tones are now my best friend. Along with your terrific process.