My developers are XTOL/D76 paired with Tri-X and FP-4. In the past I would occasionally use Rodinal with both MF films. My results with Rodinal have been unsatisfactory 60% of the time. Negatives tend to be underdeveloped/underexposed or have sagging mid-tones. I'm calibrating my film/developing time/agitation to achieve consistent results using Rodinal. I'm using the guidelines found in Popular Photography, Dec 1979, by Bob Schwalberg. The image qualities I'm looking for are sharpness, ability to separate highlights, increased brilliance vs a general purpose developer. Increased developer shelf life is a positive. I'm trying HP-5 due to its acutance. The last roll I shot was HP-5, rated at 200, metered with an incident meter set at 160, shot with a 1956 Rollei F/2.8 and light yellow (factor 1.5) filter. Souped at 14 min, 8cc Rodinal with 17oz of water, agitate 1st 40 sec, agitate each 60s (3 inversions in an oversize metal tank), 1 inversion each 30s for first 7 min. After 7 min reduce agitation to 3 inversions each 60s. Light conditions were full Central Oklahoma Nov sunlight with wispy clouds. Light intensity similar to upper Midwest in summer. 120 negatives were slightly thin only achieving an acceptable print contrast on E-maks G3 if toned. Enlargement 8x6 on 8x10 paper. How much should one derate Tri/X or HP-5 to achieve full film speed when using Rodinal? How can I improve low tone/mid tone separation? Would it be helpful to extend development by 1 min without agitation hoping to bring up low tones without building density in the sky area? Just looking for advice on optimizing Rodinal for landscape images.