Thanks.....I have been printing T400CN for about 2 years without the Splitgrade and it's worked well on Polycontrast paper although manipulation of contrast is definately needed. You have explained something to me that makes a lot of sense and this has been a real eye-opener for me. No one else has told me this and I think it explains a lot.
Separately, I have been thinking of going back to Tri-X because I like the "look better." This is another reason to do it--ease of printing.