Once upon a time, I shot a lot of Adox CMS 20 and tried developing it in different dilutions of Rodinal at different times and agitation schemes. While Adox's Adotech developer did deliver beautiful continuous tone, not to mention how fine grained this film is, the Adotech developer was pricy and didn't have a great shelf life. You were best off shooting enough rolls to use the developer up in one shot. However, it also became clear that it was difficult to get continuous tone out of this film using anything but the Adotech developer. The best results I ever got with Rodinal was when I rated the film at 10, diluted the developer 1:200, and developed for 18 minutes using normal agitation. One reason this method worked so well was because it was an overcast day. When I tried this shooting/developing method on a sunny day, it was back to pretty dense negatives. However, all that changed recently when I was recently browsing away at The Online Darkroom and came upon Scotty Elmslie's attempts at developing Adox CMS 20 II in Rodinal and HC-110. He was able to get pretty decent results with Rodinal, aside from some bromide drag, but really hit the sweet spot with HC-110 (Dilution G, 1+119), so I decided to give it a whirl. I used the 120 version of Adox CMS 20 II, exposed it at ISO 8 and developed for 15 minutes at 68F with 15 seconds initial agitation and 10 seconds at the halfway point. This method yielded no bromide drag and there was no uneven development from too much agitation. Granted you are shooting at ISO 8, but even with the newer Adotech III developer, the instructions say to shoot this film at ISO 12 in normal contrast situations and ISO 20 in reduced contrast situations. I'll post a few shots below. The camera I used was a Mamiya C330. All shots were either f/5.6 or f/8, which also necessitated the use of a tripod. Metering was done using a Nikon D810.