Hi Gabriel,
To begin with: I understand by what you write about it, that writing English is difficult for you. But I think, that you made yourself very clear in what you wrote 😊. I'm not a native English speaker also. And I know the difficulty to write something complex in another language.
So I understand from what you wrote, that in your solution you need much more layers than 128 and then you can make a choice which layers you use. So then there is a lot of work to do for the team of VSL I think.
I for myself I think I would perhaps never use the most loud layers of a Steinway. But I'm very aware that that is a cause of personal idea for the ideal sound.
I had last week the opportunity to play in a church service on a very beautiful Steinway, a Steinway B (2,11 m), special hired for that occasion (it was with the funeral of my father, who died last week. He was 95 years old, and the piano had always had a very special place in his life. He had a Steinway O 1,80 m and I played the last years often for him. He couldn't play anymore). But on that Steinway B I felt it as a pleasure, that I didn't have to do so much to get a loud tone, almost without heavy arm weight. Of course I used a little, but I got a loud tone very easily. And also playing very soft was easy. The micro dynamics went so natural, in my feeling the piano invited me to play very sensitive and beautiful. For me playing became much easier! I'm sure that that Steinway B could sound much louder than I used, but I didn't need that at all, and I really could play a fortissimo. I think some pianists use a louder fortissimo as I do, but I know also from certain concert pianists who have the same sound ideal as I have. So for me it is not a problem if I miss the loudest tones, because I can express myself very well without them, just as on that real Steinway (in the same week I bought the VSL Steinway and in the sound were really many simularities with the real one. But the keys of the real Steinway played definitely much more easy! I have the MP10 of Kawai). Sorry, a whole story.
But I understand that you need the loudest tones also, and in that case you search for opportunities to use that part of the instrument . I sincerely hope that there will be a solution that works great for you!