Mouthpiece measurements and pitch

[Tubaryan12]

I am looking for some information on the relationship between the several quoted mouthpiece measurements (cup depth, throat, backbore, etc.) and what effect the size and combinations have on pitch. For example; if every thing else stays the same, if you increase the size of the backbore it will _______ the pitch. Don't break out the calculator for exact amounts, I just want general information no matter how small the effect may be (if any).

[horto008]

I don't have much time to look up the dimensions, but moving from a GW Diablo to a Perantucci PT50+ on my PT6 moves the pitch down 15 cents. Just don't forget most of that is probably me.