I would say that the compensating effect is based on exhaustion: after agaition there is a equal amount of developing agents per area, in the highlights the developer gets exhausted much faster than in the shadows. I used Rodinal 1:100 for about 40 mins with agaition once per 5 mins, so the highlights were actually for e.g. 8 minutes (assumming exhaustion after 1 min), while the shadows were developed for the full 40 min. Done at 200 C.(posted 8972 days ago)For a higher temperature, say 250C, the exhaustion is reached faster e.g. 40 sec instead of 1 min, as development is faster. So I would short the cycles from 5 to 3.5 min. With the same number of cycles (8) this would give about 28 min.
Instead of using even thinner Rodinal (1:200), UNLESS for Technical Pan, I would rather extend the time betwenn agaition, to increase the relation between shadow developing time and highlight dev. time. Thinned down Rodinal is running low on sulphite, a fact which increases grainsize.
Wolfram