A surprise: D316 (at the shorter dev-time) is delivering finer grain than XTOL in the shadow- and midtone-portions of the curve where it matches XTOL's curve. In fact, even the overdeveloped D316 roll matches XTOL's grain (judged by 22x loupes). The curve's shape looks like Tri-X. Here are the two TMX/D316 curves with the Tri-X/XTOL curve (in red) for comparison:
Originally Posted by Photo Engineer
I think I'll boost dev-time of the green curve a little (to 14.5 min) to match the curve of Tri-X, and say, "If it's good enough for Kodak, it's good enough for me." And grain should still be finer.
PE: I appreciate all the help you provide. Thanks!