Chas, I find your scans interesting, but discouraging. My LiteOn 165H6 produces about the same result, but my old LiteOn 1693 burners do much better.
I'll bet if you scan those discs with a 1693 you will get less than half the errors. But my 1693 burners really shine when burning this media.
Here's a typical scan of a first burn. Sometimes I get even better results. I wonder why. I also wonder why the later LiteOns can't do this.