Ok.... I will share what I do... First of all, I did a zone system film speed test to determine my film speed... Then, I did a development time test to establish my "normal" development time with my cold light enlarger, normal developer and normal paper (i.e. paper that I use to make proof sheets). This process gives me a complete calibration with my camera, film, film developer, Cold light enlarger (it will work for your diffusion enlarger), paper developer, and paper. After several rolls of film, I was satisfied with my Normal time. Then I did a test to lock in on my N+ time (I use N+ 1.5 the method taught by the late Fred Picker of the Zone VI workshop). This whole process was a lot of work, but it's worth the trouble because you no longer have to worry about exposure and development time except for a few tweaks now and then... There are several books including "The Zone VI workshop" which is always available on EBay that provides these test methods. Also, this methodology will make you focus on one set of film and print materials because if you change anything, you must re-test!!!!
I shoot the Hassy, and I use 3 backs which in essence gives me 3 cameras... When I am shooting black and white film (99% of the time) I always use 2 backs. I shoot the same film, Tri-X, in each back. One back is labeled "N" and all film in that back is developed at my "normal" development time. The 2nd back is labeled "N+1.5 and all film in that camera is exposed in a manner that dictates N+1.5 development time. When I am shooting I take two exposures of a scene...i.e. one for N and the 2nd for N+1.5 This gives me 2 negatives to work with in the dark room on each scene. For me this is adequate flexibility to meet my needs. I keep the 3rd back ready in case I want to shoot color (very rarely).