No one has answered because pitching is more complicated than that. Essentially, the majors(splits, pitches, control) have "bottoms". One you reach a certain point, the other ratings can't "save" a pitcher. However, as long as they're above that threshold, excellent ratings in other categories can fix one bad rating.
For me, VR is the most important. Then control, VL, P1. Yet you'll find my pitching staffs littered with 40ish control guys because the splits and pitches resolve that problem. And one of my most successful LR had a VR of 52.
GB and velocity are secondary ratings. Tie-breakers, so to speak.
For starters, I like 4 pitches. Short relievers only need 2. 3 pitch guys often end up in long relief(unless their stamina lends them to short relief).
Finally, my formula changes with the park. I don't use the same formula in Albuquerque that I use in Charleston.