Played ‘in the red’ for years as a kid. It hurt my top lip, a lot.
The way I fixed it many years ago was with the help of a local legend who put me onto Jerome Callet’s Double pedal ‘slide ups’ (this is an from an early book, not his current spit-buzz program). This helped train my top lip to stay close to my teeth. That’s the term “Top lip close to teeth” that helped me remember. I recommend this if you have trouble with your top lip being curled out when you play and you are playing in the fleshy red part of it.
With Windworks’ help I have now trained my bottom lip not to curl in and pinch off the air through the straight air concept. Thanks Greg!