curlicarli... I'll trade some of my flatness for some of your volume!
I don't worry too much about the pH of my shower products (shampoo, rinse-out conditioner) as long as they are lower than the pH of 7 (the pH of water). I figure I'm rinsing them off with water which is diluting them and raising the pH anyway. It's a good idea however to have leave-in conditioner and styling products be at a "happy pH" of 4.5-5.5.