I talked with a chemist friend of mine and he recommended acetic acid to pull down the Part A pH. I had tried sulfuric with poor results since sulfuric is also a nice oxidizer (didn't know that). I tried boric acid figuring that I'd get some buffering out of it too, but I added quite a bit and the pH didn't move much. I'm not that sure I really need a buffering agent anyway. I'm sure I can get good enough shelf life. Tray life is really the challenge. I know it is possible because the Rollei and Moersch have much better tray life. The same chemist friend suggested either more hydroquinone or maybe trying ascorbic acid. Ascorbic acid is a weak developing agent, but it may be OK in small amounts. Worth an experiment or two.
Regarding Ansco 70, it looks like the main difference between it and what I am doing is that it uses potassium metabisulfite rather than sodium sulfite. Is potassium metabisulfite a better anti-oxidant? The other differences are more KBr and a different alkali.
I'm a good mechanical engineer, an OK photographer and a lousy chemist!