I had been using my Epsom 1430 with Special Edition K6 on Hahn Photo Rag on my Mac running Catalina 10.15.2 with perfect output.
I decided to try the CISS system with Special Edition with UHD matte black and Hahn Photo Rag. I did a thorough printer cleaning with PiezoFlush prior to installing the CISS. I ran the nozzle cleaning cycle twice, then printed a nozzle check which looked perfect. Test print of Printer Test Page was perfect. I then tried a test print with Print Tool with appropriate curves (see picture). The first print came out blank (no ink).
I then uninstalled Quadtone Rip, Piezography and Print Tool and installed fresh copies. Print Tool 2.1.1, QTRip 2.7.10 and Piezography Community Edition. Now all the prints have banding. (See print)