"8 rolls per process" for 5 liters is very low. In our Jobo rotary processing, there's 300 ml of processing solution in a tank accepting 120 (and even 220) films, that is 1/17th of 5 liters, and means that only a half 120 roll could be processed at a time if I followed these instructions. It's just silly. These instructions don't make a sense at all. Good thing that they are not a law that must be followed . I think I know how to use the kit after all.
I've used the Fujihunt 5 litre C-41 kit by mixing the concentrate required with water for Jobo capacity without issue.