Am back. Been busy past couple months so I didn't have much time to work with the rips.
I did make some progress filtering. I darkened lines, slightly sharpened, and tried to remove mosquito noise. There isn't any mosquito noise in this example, but if you zoom in you'll be able to see a difference in clarity.
I used VMToon and MosquitoNR.http://screenshotcomparison.com/comparison/184421
Comments, questions, suggestions, rants welcome.