Forgive me if I'm missing something here, but wouldn't it be easier to buffer your water to whatever pH you need it at? If it's not that simple would you please explain why not to me? Always good to learn something new.
My water is REALLY hard here in saskatoon so buffering it would entail lots of "work" on a weekly basis where as just running pressurized co2 would keep it at a constant ph where the shrimp would survive and thrive. Only been in this hobby for about a year so I might be going at this the wrong way...