Good Morning, Keith,
"It is interesting that Konical is using T-Max developer even for the 4x5 film sheets as T-MaxRS is usually recommended instead."
When the T-Max films were introduced years ago, I started processing them in either D-76 or HC-110B (can't recall which right now) and got fine results. When the T-Max Developer became available, I started using it and have found it highly satisfactory and very handy. Its only drawback is that it's a bit expensive, but I don't process large amounts, so that is not a problem. I know, of course, that Kodak does not recommend the standard T-Max Developer for sheet film, but, again years ago, I failed to notice that admonition on the bottle; the stuff was working fine for me with 4 x 5, and by the time I did notice the warning,there didn't seem to be much sense in bothering with the RS version. (Some users apparently have had problems with some kind of deposit or sludge on sheet film processed in regular T-Max.) I haven't experienced that, so I stick with the regular stuff for all formats.
Konical