Great images, Alan! That's the kind of stuff that keeps my trying at this! And I should have mentioned, I'm using Doug's negative holder with ANR glass.
So here's one from another roll, scanned with the Epson software and not adjusted at all (the only post-processing was shrinking and jpeg-ing it in photoshop).
Same ugly vertical stripes,general murky appearance.
The outer surface of the glass is spotless, but I notice that there seems to be an uneven spotty haze on the inside of the glass. I think I'll explore cleaning that...