It was a long time ago...I sent away to Claude Humber after reading about longer facings..perhaps it was the Baines History of Woodwinds.  ..He sent me one of his clarinet mouthpieces...38, 21, 12, 6  tip is 1.13mm.   It isn't a long as I requested from him but it does play well...all his mouthpieces are plastic... Back then I probably paid 6 dollars for it.  I must admit he was able to produce a wide variety of mouthpieces.  Lush sounding alto mouthpieces in a "Hollywood" facing to edgier mouthpieces, classical and even a Benny Goodman facing.  I only wish that distance prevented me from meeting him in person...he treated you like you were Benny Goodman. I wonder if his books and list of facings are still out there somewhere.  

--- In MouthpieceWork@yahoogroups.com, "John Price" <john_w_price33@...> wrote:
>
> It was a long time ago...I sent away to Claude Humber after reading about longer facings..perhaps it was the Baines History of Woodwinds.  ..He sent me one of his clarinet mouthpieces...38, 21, 12, 6  tip is 1.13mm.   It isn't a long as I requested from him but it does play well...all his mouthpieces are plastic... Back then I probably paid 6 dollars for it.  I must admit he was able to produce a wide variety of mouthpieces.  Lush sounding alto mouthpieces in a "Hollywood" facing to edgier mouthpieces, classical and even a Benny Goodman facing.  I only wish that distance prevented me from meeting him in person...he treated you like you were Benny Goodman. I wonder if his books and list of facings are still out there somewhere.
>

John  The mouthpiece you have just described sounds just right, with its LONG lay, gentle curve and close tip. The De Franco with its LONG lay and .067 tip is a monster. I used this combination for a time until I learned the art of refacing. Though it seemed to play smoothly and with great expression, articulation was poor and it did not sound as good in tone, on recordings, I feel. The open tip was not the problem, but the LONG lay coupled with the open tip, was. When I say LONG, I mean 19mm. I use 18/17/16MM lengths. One example is .055 tip .630(16mm)length.  32-23-14-8.5
Unlike sax mouthpieces which sometimes increase in length with increasing tip openings, I don't think this is a good idea on clarinet and I have found the opposite to be the case.
I suggest you take down the table on the De Franco, to shorten the lay and close the tip.
EDDIE