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Folks, I need something a bit 'bigger' for my 621 F.

At the moment I use the stock mouthpiece 67B? It sounds fine and the tuning is good.

I'm looking at the Bobo solo and new Carolino models. Were these guys feeling what I'm feeling about something a bit bigger (I realise they play the larger bell instruments).

What about the Romero mouthpiece that Sergio used to play? How does the spec of that match up to what I've currently got?

It's a very subjective, but any thoughts appreciated, particularly on the technical side of things.

The bobo solo is a very small mouthpiece; of you want something slightly bigger than I would suggest looking into something either Warburton (they are great), or a smaller mike Finn (if you prefer bowl-cup mouthpieces), or giddings and Webster.
If you really want to try a bunch of pieces then go to a convention or borrow your buddy's. I can't tell you what works for you, so you really need to try some for yourself.

Ooops, it's actually a 67C ...

Obviously I can go somewhere to try them (maybe not the Carolino), but I'm quite busy at the moment.

If anyone has any experience with the difference between a 67C and the Bobo solo and or Carolino mouthpiece. I would be interested in THEIR experience.