Well it's been 3 years since i switched to the 3b mouthpiece and i'm quite sick of it really because with this mouthpiece ive never been able to play a high e (above the staff) with a full sound. I've talked to instructors for....well uhh instruction on what mouthpiece i should switch to or if i even need to switch. Most have told me to switch because i have thin lips, and have tutored me on how to switch. about 8 months ago i tried switching to a 3c, yeah its a pretty big change but my instructor helped me. After a long 4 months of trying to switch to the 3c it just never felt right i could never reach a d on it and it just sounded empty. I also tried switching to a 1 1/2 b before and that mouthpiece never felt as natural as my 3b. So does this mean that i am forever stuck playing on a 3b? or have i just not been giving the other mouthpieces enough time?