In the mid to late 90s I used to use the combined C41 film/paper kit from Jessops. When using this to process paper I used to dilute the working strength developer by 50% and double the time it was in the processor from 1.5 minutes to 3 minutes at 38░ C used one shot.
I am not 100% sure that the paper was an RA4 type, I suspect it was but am not certain.
Now my question, I have bought the Rollei Digibase RA4 Mono Kit from Firstcall and there are very limited instuctions with it, by limited I mean next to nothing, temp 38░ +/- 0.3░ for 45 seconds. Has anyone attempted to dilute the working solution by 100% and then compensated by increasing the developing time by 100%?