There are similar threads but I hope you don't mind me asking for some advice in a new discussion.
I'm a fairly advanced player but I think I should be much more solid. I have a good concept of air and staying relaxed but my embouchure is holding me back. I have really thick lips, and the inner rim of my mouthpiece sets on my vermillion (the pink or red part of the lips). It seems that most people say this is bad, and I can see why. It seems to constrict the flexibility of my lips so that I have less control of my aperture. I can't manipulate the aperture without adding pressure in the upper register, which causes me to go sharp, crack notes, pinched sound, when I get up to F above high C. I'm not even happy with my high C, the tone is usually bad and unreliable.
Any recommendations on getting "out of the pink?" I feel if I place the rim any higher, I'll just be playing on the vermillion of my lower lip and have no support on the bottom. And I'm not thrilled with the idea of rolling my chops in. I know it's hard to diagnose these problems on a forum but any recommendations would help me out. Or even just words of encouragement!