a couple of comments, one general and one specific:
Is it really possible to say things like "a vintage Buescher needs a large-chambered mouthpiece to play well in tune"? Doesn't the player's own characterisitics play a huge role in this, I mean like a gigantic role? I am primarily a tenor/bari player, I like big, dark, warm sounds on both those horns, and when i play my Big B alto (only for classical literature in my lessons at school) I find mouthpieces like the Hite, the Morgan 3C (often recommended for buescher altos) and the huge chambered "The Buescher" mouthpiece (which should obviously be very compatible) all play extremely flat for me, especially in the higher register. i have a huge oral cavity (a big mouth

) and this could be the culprit.
I found what works best for me BY FAR is the Vandoren Optimum AL 3, but conventional wisdom (read: stuff i've read on SOTW) says that these traditional kinds of smaller-chambered classical mouthpieces are not supposed to play well in tune on my horn. I'm satisfied now, so this question is less about advice for me and more of a general principle, but how much should one take these kinds of general statements into account when figuring out their setup?