Pete: I know we've been over this ground before, but for the record here, I find no need for "large chambered" soprano pieces on any vintage soprano I've owned. Frankly, I don't know what a large-chambered piece is, unless one is describing the opening to the barrel. Vintage soprano pieces do not work for me.
My favorite soprano piece is the Super Session J, followed by Morgan Vintage (I have 6 and 7 and prefer the 7), STM Link 8* (I also have a 7* and prefer the 8*, although the STM Links play harshly for me), Runyon Custom 7, and S-80's in G and J come to mind.
The only problem I have on vintage sops is the length of the piece. For me to come to pitch (and not much beyond A-440) I need to shove on a fair length. The S-80's and Morgans were too long - so I had the end of the barrels shortened. Now they shove on far enough for me. The upper octave pip and its rib on vintage sops is what prevents me from shoving on far enough - modern sops don't present that problem.
So, my Bueschers have good scales with those modern pieces and my Conns had decent scales. A Saxello I owned was awful, though, regardless of what mouthpiece I sued. DAVE