If I may ask a question that could possibly have been answered already:

Are your scans being captured with a color profile so that it "looks right" directly off the bat, or are they being captured with a flat color profile (i.e. darks look too bright and brights look too dark)?

Some of the clips you've been posting look abnormally dark, and I'm hoping that's due to a quick and dirty color correction, and that it isn't baked in, because if it was scanned that way, those darks will be really hard to correct, while if it was captured with a flat profile, the contrast can be pushed or pulled back as much as needed without sacrificing information.