Paul kindly sent me his qidf, it helped verify I was using the right one. All parameters were the same. So with that question out of the way, can anyone suggest a tweak that would get my blacks back the way they were? Should I relinearize? Mix up a new batch of Cb6? But I was getting good blacks with the current batch of ink, it was a fresh mix. Paper's the same. Nozzle checks are perfect. I can't think of anything I changed.
Just went to my shop and my Eboni 1.0 is dated 2015-12-11. I think that means Dec. 11 - or is Nov. 12? Anyway, either way I'm within the zone.