I think I know what might (?) be happening although your color match program is very very good. It is sampling the dark grain in the shadow and throwing off the sample in a sense.
Making the the regrade slightly darker in the dark areas. As the 35mm has lot’s of dark speckles in the white. This is obviously sampled and throwing it off. As the WOWWOW HDTV version has no dark grain speckles.
It’s possible, but when I directly compare the regrade and the print, I personally don’t see that the dark areas are darker for the regrade. There’s also bright noise in the shadows on the print, so that should even things out in terms of the noise. What I did notice, is that there’s also a slight blue cast on the left side of the frame for the print.
