I've just stumbled across this thread, and find it fascinating as the Aviphot 80 and 200 derivatives (Rollei Retro 80S and Superpan 200) are two of my favourite films.
I should say that I only use them in 35mm format, print only in the darkroom (scans for contact sheets only), and have only experimented with a few developers. The developer that I have found to be excellent for both is Adox Atomal 49, which I believe is very similar to the old Calbe 49. I use it 1:1, and find that it gives very fine grain, tames contrast, and produces very nice mid-tones in the prints. I find this developer particularly useful for the 80 film, as I've always found it the more difficult of the two when it comes to taming contrast and achieving the "creamy" mid-tones that I like; I find that this combo gives best results at an EI of 50 rather than 80. With this film, I've never had good results using my stand-by method of Rodinal stand development (typically 1:200), with problems in both grain and contrast.
Perhaps counter-intuitively, I've found my Rodinal experiments with the faster 200 film have been better, although the perennial problem of achieving shadow detail without blowing highlights is still there (at whichever EI I've used), albeit to a lesser extent than with the 80. I use the 200 mostly for IR purposes - using an IR filter, and rating it at EI 25, it's actually a very usable hand-held option for IR shooting.
I've recently been experimenting with the Bellini Nucleol BF200 pyro developer with these films, with initial results promising - nice smooth grain with accutance, but still struggling to nail development ratios and times in terms of contrast....
For anyone struggling to get the best out of these Aviphot films (very much worth the effort, in my experience!), I would certainly recommend trying the Atomal 49 as a proprietary option. Being a powder developer it can be made into stock solution in 1litre quantities, which I find has a useful shelf life of around 6-8 weeks if kept in full bottles.
