I'm in high school, and it's my first year playing the sax. That might be why. I got a new mouthpiece (Rico alto 3c) and ligature (Rovner dark 1rl). I'm having more issues than I used to, and I can make low notes with a rolled lower lip. The problem is, when I use the lower lip embouchure, my cheeks start feeling like death after a few bars. The reason I chose the Rico mpc instead of a Yamaha 4c, which is a good beginner piece, is that I play Rico reeds. The reeds and mouthpiece are the same brand, so I thought they'd match up well. I guess not. If it helps, I use a Selmer AS400 Alto.