My CP-31 is set at 34C and 280mm/min for all baths, which I have set up as dev, blix, and wash. All the baths are warming up to their proper temps and the paper is going through at the appropriate speed. I will try to tray develop, though, and see what happens.
Ha, yeah, I tried the filtration, pushing the Durst to numbers on both extremes and I do see color change.
All of this makes me think it's the chemistry, but I will run some more tests tonight! Any other thoughts are appreciated as well!