I’m sorry to say it, williarob, but it might be as simple as a levels issue.
Top: before
Bottom: after ColorYUV(levels=“TV->PC”)
N.B. I don’t think that the standard adjustment works well for the whole film (at least not for the blacks), but it definitely gets the levels in the right ballpark.
Yeah, blacks look a bit crushed to me. But some improvements could be made.