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I use that exact mouthpiece on my Willson Eb and on my M-W Eb Cimbasso. It works great! I have experimented with it on CC tubas in an attempt to get a smaller sound. I think it also does that pretty well, but I only try that for very special circumstances and not on a regular basis. For example, I used a 30F on my Nirschl 6/4 to play the Boehm Sextet. It gave a nice bit of transparency to the sound with such a large instrument. Intonation was really good for me but I also use a 30H normally on the Nirschl so others may have different results that are not consistently using Laskey mouthpieces. Good luck!

I use a 28F on my 2165 CC. 30F works great as well. As Jay said, it provides a clear sound on a big CC.

I use a 28H on my 3/4 Rudy CC and a 30G on my Alexander 163 CC. I love Laskey mouthpieces!

Jeff