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I've just switched back to my pt50+ after a stint on a caver.I feel like I've come home.Is there an f tuba equivalent to the 50+(as in conn helleberg/helleberg 7b)?I like the 7b but wish for a pt style rounded rim... i welcome any input from m.p. manufacturers as well.....

Have you tried a Mike Finn MF4?

Try LOUD Mouthpieces http://www.loudmouthpieces.com/ , sounds like maybe the LM-15 is what you're looking for. With these mpcs, you can change the rim to fit your preference. If you have any questions, call up Joe Murphy, he's pretty helpful about suggestions. I'm trying out some right now...