FWIW, I just posted a response on another thread (Monette) that is relevant. Ive switched to a shallow mouthpiece and have been experimenting the past month, playing exclusively on the new shallow MP. I have found playing very forward and open works the best. It is odd at times how forward and open, almost feels as though I’m not making any change in my lips. The key for me has been letting go of trying to hit a note and instead focusing on playing as open and relaxed as possible and using my sound and feel as my guide.