As far as differing developing times ... I guess, to start, my best advice would be to strike an average.. and go from there.

The disadvantage to an acid stop bath is the danger of producing "pinholes" in the emulsion. Ilford and others studied this at length, and the latest I've read suggests using plain water, or reducing the "usual" stop bath strength by 50% - 75%. I use plain water, and have not been troubled by pinholes for the last ~~ bunch of years.