These images look quite good so far. It seems like you've really locked in on exactly what sort of manipulation was done to the colours and contrast, and undone it as precisely as could be hoped for with general settings. Of course, many shots would still need individual correction, due to things like desaturated laser blasts and intentional colour changes—for example, the red on the blockade runner was a dark shade of maroon in the original version, while even with the correction it still shows up as bright red due to the 2004 change.
Looking forward to seeing what else you can accomplish with this. Is there a way to replicate these settings with AviSynth? I'd be very interested in that.