To add to this thread:
I live in Utah. Very dry. I get NR if I lay the negative on the glass right after cleaning. If I let it dry, they go away.
I also use a single side anti reflection glass for silver printing. I would like to use it for platinum as well, but it is also a 94%uv glass. It tends to slow things down a little.
I hope to find a source of non-UV antiglare glass. Anyone? Anyone?