James Markus wrote:
The impression I have now is that the more dilute, lower room temp, and stand development agitation technique will result in fine grain + sharp edges. Hopefully that is correct.
Pretty much, although I wouldn't say "fine grain," just "finer" than what you usually get with Rodinal.
Lower room temperature is a question mark. When I was researching all this I found statements (backed by experience) saying that Rodinal at 18°C (the original recipe) resulted in smaller grain than Rodinal at 20°C, but I found other statements (also backed by experience) saying it made no difference. I've done it both ways and I'd be hard pressed to see a difference myself. In summer I do it at 20°C and in winter I do it at 18°C; I use a big beer cooler with a water bath to keep everything at a fairly constant temperature during stand. And I don't use full stand development, which can result in bromide drag; I use semi-stand with three gentle agitations at the 30 minute mark.
The sharp edges are definitely there, and you get a lot of tonality with this approach, even with films that are very high contrast. The most amazing result I saw was from photographer John Scarbro using Film Washi S (no longer available), which always came out just black and white for me with no shades of gray at all; when he developed it in Rodinal semi-stand it looked almost like a normal film.