Well Indi, the title of this thread is "Anyone Wanna See..." That didn't make me want to read any further and I wouldn't have given it another look but I've been laid up sick and have lots of time to kill.
I believe I may have answered you on a different thread about this? I'm not convinced that your pH measurements are reliable and that is where I'd look first. I don't believe anything but a lab quality instrument, two of them if the measurement doesn't make sense. Good luck, Bub.