I looked at the .RAF file for curiosity. But I see no piece of film-strip colour in there? The digitalize+ blocked it all? How do you know the filmstrip colour / blackpoint then?
This is what my CLI tool autodetects without having a filmstrip to scan. (It searches for the brightest spot then).
What you see here has the exposure raised a bit (and then highlights lowered to keep the detail in the clouds). This is without any custom profile or anything. (Loaded the file up into Rawtherapee, switched to neutral, rec2020 linear output, cropped to just the picture to get something that resembles a scanned .tif file, and this is what I got… isn’t that wrong, right?).
No clue what the original scene or the filmstock should look like ofcourse.