I shot a few rolls of Retro 80S over the weekend - when my RLS developer arrives I'll post some results...
RLS/CG-512 is an ultrafine grain type developer which should be used on 24C. So for an acurate processing you need a Jobo processor or something like that. And like all ultra fine grain type developers you have to over-expose the film +1F stop which means an E.I. 25-32 for the Retro 80S film.