You probably already know of the 'Massive Dev Chart' http://www.digitaltruth.com/photo/devchart.html - has xtol 1:3 dilution times for a number of films, but, alas, not for Delta 400 (new).(posted 8438 days ago)I've been using Microdol-X for Delta 400 rated at EI 320 and I like it, a lot.