This is a good paper on the rhizosphere and the science behind why PH is less of a big deal in organic/biodynamic soils. If youre in a hurry read the part about Root Exudates and Mineral Nutrition.
Thats not to say that if a very large portion if your soil (in this case rice hulls) is slowly breaking down and raising PH that the microbes and your plants will be able to buffer this conpletely, however it will certainly help smaller ph swings. And as Sea suggested, we are rarely operating in a perfect world.
Finally got a chance to read it, really great stuff in there! Thanks again. Also, I did some research on the "recharge" inoculate you mentioned...looks pretty legit. How often do you add it to your teas?