Okay Eddie Haskell you've opened an interesting door here and the timing seems right for me to pay attention to see if my spring water is basically fine as it is or if I'd benefit from some adjustment to ph in the mash or minerals to the water.
So, now in addition to the ph stabilizer, I've got some ph strips coming and a small jar each of gypsum, calcium chloride, and phosphoric acid.
Time for a new column in my spreadsheet for each batch. Will likely take months to evaluate. Good news, more beer needs to be brewed!