I was curious if you had had chance to try using the colormatch thingy for a whole scene from just one still yet? That way you could mix and match sources or even use one of the 70mm scans frames/screening photos/ production stills/other source etc etc.

Also whether you've compared your 1992 FS set with a 1982 vhs preservation, they are understood to be all from the same master between those years but it might be possible one version has a slight edge. Maybe once you've captured your vhs releases you could experiment with them via colormatch?