where does kodak recommend 4 minutes for jobo? I've only processed a few batches with my 5L kit in my jobo but I've been using 6 minutes for normal development. 5 minutes for N-1/2 (one batch) turned out perfect.
We're talking about the color developer. The color developer has no effect on push/pull settings and should always be left at the full 6 minutes (4 minutes with a jobo) no matter the B+W developer time.