I'm mainly a euphonium/baritone player. A year ago I bought an old beat up 3/4 King 1135 to learn the Tuba. It came with a Bach 18 Mouthpiece. After a year, the Bach still feels too big to me. I'd like suggestions for a smaller mouthpiece.

If it makes any difference, I use a G&W Kadja on my euph.

Thanks for any help.

KKORO