I have an email or two into Mike Wood and Sam Ahn at Samsung about the Advanced SM code to see what happens.
Did you do the 2 point grayscale or the multipoint grayscale?
Good that the FW was up to date so we can rule that out …
Interesting to hear that the day and night modes were different enough from the movie mode … you’d think they were just place holders … but apparently not.
As for the ISF thing … we are all friends here and Doug Weil (owner of the 313 site) is a Lion AV member and THX calibrator too. Info flows from there over to here fine. It just doesn’t go the other way. 🙂
I wouldn’t worry too much about the physical position of the contrast. If you need to go under 70 .. so be it. It is not your fault … rather the TV’s. You have to make due with what you get. Give them a reference mode and then give them the day mode with some compromises like higher contrast or back light … (preferably backlight)
Regards