Actually, I would love to get better colors on the Astrocade games. The current ones are an evil hack and I'm sure they are incorrect. I didn't touch them compared to the last time.
Ideally I would write code to run on the Astrocade hardware and cycle through the colors one at a time. Then someone with an oscilloscope would report the final RGB output voltages. It would be a tedious job but we could finally get proper results.
If someone is willing to do that, I would be happy to write the code. I'm afraid there is too much subjectivity in photographs to rely on those for data, and using an Astrocade console isn't sufficient because it doesn't include the effect of the RGB converter board.