Your DL scans look about the same as mine on that Ritek DL media. I just think it is crap media. I had much better luck with the Verbatim DL.
I burned the Ritek on both my BenQ and LiteOn with similar results. I burned the Verbatim only on the BenQ. If you look at some of my latest posts you can find the scans and the results -- 2 perfect movies (Verbatim only) out of 6. Don't know what happened with the 3rd Verbatim but it didn't play right and none of the Ritek played right.
BTW, when I burned the Ritek on my LiteOn I used CG5E.