How about using a more dilute solution of Rodinal, more time, and less agitation?(posted 9488 days ago)When developer comes into contact with the film, it starts reacting with the emulsion. The highlights exhaust the developer faster than the low values do. The more dilute a developer is, the faster the highlights will exhaust it.
I have started experimenting with Kodak Tmax 400 at 3200. I developed my first roll in D-76 1:1, 68F, 20min, with agitation once every minute. The shadows came out reasonably well, if slightly thin. For my next trial, I am planning 30min and agitation once every two minutes.