Well as much as I like Xtol I'm considering a switch, simply put I'm not using it fast enough to keep the stock fresh. Color is taking the biggest share of my shooting. So, DD-X and HC-110 are the short list candidates. DD-X would get used up quicker because of it's lower capacity so the real cost per roll after tossing the out of date Xtol would be similar. HC-110 concentrate lasts long enough that it doesn't matter. Delta 100 and 400 are my primary films. I want to try to use my Jobo CPA 2 with a 1520 tank so a full load is 2 films in 240ml. With the DD-X rotation should reduce the needed time by about 15% per ilford's fact sheet for the Deltas, but the volume of developer is about half of the recommended volume pushing it mathematically close to Ilford's "reuse" capacity limit which would add about 90% to the time per DD-X's data sheet. So standard time * .85 * 1.9 = about 1.6 * standard for a starting time. Does that make sense? Will DD-X work well used this way? HC-110 looks like it may be easier to use and more flexible in mixing. Any thoughts?