Argh... I'm not wonderful at verbal communication. If I could write I wouldn't need photography so much. Sigh....
No. What I'm saying is that if you keep all things in your workflow constant (that is, you develop your film to the same Dmax and CI), that changing dilution (of solvent developers) will make a really small change in your image quality. Changes that you may not even see until you start making prints 75 x 60 inches or bigger from 4x5 film (doesn't anybody actually print that big? I don't know anyone who does). From a practical perspective, changing dilution is mostly about controlling development time.
Changing processor speed on a rotary processor, OTOH, won't make any change to your image quality at all (again, if you keep everything else equal). All this does is effect the rate of development; if you need a longer development time, slowing your processor speed will give it to you. But that's all it does, it has no effect on image quality. You can
look this up in Haist if you have a research library close by. I don't remember which volume it was in, but that's why it has an index.
If you want better image quality from a scanning-only workflow, perhaps the biggest change you can make is to develop to a lower Dmax. How low is optimum for your materials, your equipment, and your workflow has to be found by experiment. You have to do that work yourself.
What you want, for whatever process you are using, is just enough density to make it easy to print. No more.
Nothing I've said on this thread applies to color films of course. Just good ol' B&W silver negative processing.
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