The aah-00h is a “little bit more outward” than anyone plays by pinching and or stretching the lips thinner in the upper register. When someone is concerned about using lips to cushion increasing pressure, alarms go off and red flags are waving.
The idea that you need more lip to cushion increased pressure is clearly not what you want to do. Learning the shape for each note is what you will or are learning in WindWorks. The shape involves aperture corners, jaw, and tongue position. When you learn how to put together the shape of each note, you should not have dangerous pressure against your lips and teeth.
That is why I insist that you follow this course’s method. If you do, you should be able to play notes above the staff softly without kicking air and jamming the mouthpiece into the kisser.