One of the pieces I am currently playing is La Cathédrale engloutie by Claude Debussy.
In the middle part there is a fortissimo section with the lowest C as pedal tone that has
to be rehit quite hard several times.
Daniel Barenboim uses his right hand for this lowest C, you can watch it from 2:35 onwards in this recording:
https://www.youtube.com/watch?v=x8o-YjpsXl8 Here the "limitation" of the Fazioli bass becomes obvious. The gain does not seem to match velocity.
I have raised the loudness of the lowest octaves on the edit page. But I think the
professionals at VSL would do a better job to improve this issue.
Best
Stefan