Maybe the best thing to do with these scenes is a manual frame-by-frame restoration and then you can insert extra frames. There are pretty simple programmes that can "inbetween" frames pretty well for you and it will likely create a much smoother scene.
I think Angel's clean up of all the damaged and/or dirty frames is about as good as that material is going to get.
None of us is ever going to make this material anything above "workprint" quality from that source.