May I ask, to what practical application will the OP put a perfect interpretation of these spec-sheet curves?

It's not meant to be a silly question, as all that consistency necessary thirty years ago - when film was the starting point for many analogue image-production processes - seems to have been removed. Now aren't we are using consistency in our own personal processes to achieve what we want at the level of an individual print (or small, personally repeatable, batches), not as the start of a long chain of analogue processes where the published result depends on perfect global consistency at every step?