I am assuming that you are compressing with h.264 RGB.
The compression usually destroys very dark details doing black crunch.
To focus on gray palette should be useful, increasing bitrate x luminance pixel.
i don't think it's RGB but YCbCr 4:2:2 or something like that. Going to RGB or 4:4:4 would also help fixing washed out/not precise reds especially with fine text.
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