This is the kind of thing that I wanted to discuss. I would be using a considerable amount of tremolo with this instrument. I would use either LMM (master) or MM tones. It is for Italian waltzes, mazurkas and polkas...
and one could also argue, that as a professional, and in a sense being competitive with
one's contemporaries, these benefits you seek will be totally overshadowed by the simple fact that
everyone else at this level is using LMMM or MMM accordions, and even with the most plebian
reeds they will by far blow the LMM off the stage
this is different for Jazz and Stroller accordions designed to use solo voce Tone Chamber
and LM tone chamber in primary useage...
in addition, i will personally suggest that, having found i truly DO prefer the most sensitive
most responsive reed for the L reedblock,
(whether in or out of a tone chamber)
this led me to prepare a set of L reeds salvaged from a late 40's professional Paolo Soprani
which i am switching into my Woody this summer
(the FisItalia with standard Artigana Voci reeds... LMMM
the MMM reeds are fabulous in combinations, but having more sonority and quicker
reed response in the L set would make me happier and make this specific accordion
even more special than it already is
you would likely need to have a very good relationship with a builder to get then to
"mix" reeds like this, i would imagine.
a really well made, well set-up L reed, even in the lowest pitches, will start more quickly
with less pitch distortion, less growl, and come up to full sonority better than the ordinary
my opinion is not always in line with true professional accordion technicians and the
knowledge they have of parts and methods, as i am an amateur regarding repairs/customization
ciao
Ventura