I would also say that my aim here is to get my mash pH "into the zone" and not necessarily wring my hands over an exact mash pH. That is to say that 5.2 to 5.3 is satisfactory for me as a mash pH. Where I have failed in the past is with regard to adding sparge water that had a high pH (especially in a pale beer) or boiling when my kettle pH is too high. Before I knew to neutralize bicarb with acid and before I had decent pH control, I was making some very offensive pale beers. If my mash pH is 5.2 to 5.3 and my sparge pH comes in around the same zip code, my kettle pH will be in good shape too.