Wow, there's a lot of stuff going on in here! I think more and more that we just got royally screwed in 1993 when they decided to use the IPs laying around and then overprocess like mad to make them look "good" for old CRTs of the era.

Good idea on those last caps-the film is definitely going to look different on modern equipment versus 70's era equipment that the prints would have been manufactured for.

I don't know if people have done this yet but two other things that might be useful: Looking for other films of the era shot with the same film stocks and films from the era shot by the cinematographers. Every person has a unique style and way of lighting that no matter what will show though and affect the image in some way. Having an idea of this and how it would affect the stock might help to give a better idea of the way the image was originally developed.