Yep, gin and tonic is the, well....tonic. Thanks for the tips. Ansel's books have been read and are in the home. I can't imagine what is wrong w/ the workflow. The safe light test shows no issues, and I use the same developer, lens, enlarger and trays when I print, trading off from one type of paper to another in one print session (usually only two hours) and often w/ the same negative. The darkroom is dark w/o stray light. I always do test strips before printing, and dry them down w/ a hair dryer to eliminate dry down issues.
I'm simply comparing the margins around the finished prints, and the Adox is really, really white. The Arista is not gray, but it's not as white as the Adox, and naturally enough the prints look quite different. The Adox prints have a lot of snap w/ brilliant whites and deep blacks. I tried this w/ and w/o contrast filters and had the same results, so I figured it was the paper base. Maybe the real issue is I'm comparing one of the best FB papers on the market w/ a budget RC paper. Perhaps that's just how it plays out.
I need to do more research and find papers w/ the least optical brighteners. Maybe the Adox is just flat worth the extra money. Nearly all RC papers use not only optical brighteners, which are fugitive, but titanium dioxide to achieve good whites on the cheap. This is not a good mix. Then they add other stuff to try to prevent issues, but it's a bad way to go if you want archival prints with consistent tonal values over time.