Hey Victor,
I looked at all your scans, and honestly, if you hadn't pointed it out, I would have never noticed those patterns. When I got banding (with Kentona primarily, and an outdated box of Polygrade) it was as though somebody brought out a ruler and made lead pencil lines across the paper. Butt ugly, and sad, because the color of especially the Polygrade was very beautiful. Like the Emaks Grade 3 but darker and warmer. Dark chocolate comes to mind.
I definitely think that lith printing brings out these anomalies in papers more than regular chemistry. If you don't like your 542 for lith printing, you will love it in Ansco 130, dilute (1+3 at 75-80*F).
I just had the opportunity to print, after a two week hiatus. It was awesome to count seconds to the metronome again, while listening to an old JJ Cale CD, which made the counting a challenge but the Scotch tasted better... Fomatone 132 is a nice matte paper for lith printing. Similar color to the 542, but with a smooth finish. Incidentally, if you do try out the Ilford Warmtone, try both the glossy and semi-matte as they produce dissimilar results. The semi-matte has a grainier appearance, while the glossy is creamy smooth. Both beautiful, but different.
I hope that helps. Take it easy,
- Thomas