I've used Tri-X at 1600 with Xtol 1:2 and 1:3. I think the 1:3 time was with normal agitation (swirl or inverse) for something like 20-25 minutes, but I don't have my notes handy. The result was quite good, but pushing it to 3200 resulted in the shadows dropping off like a rock (toe values like Peg-Leg Pete). I have not tried it with Diafine. (yet)