I just started using a ph meter too. I assumed that after thoroughly mixed would be the first measurement. Hearing that yours climbed throughout mash, I will measure every 15 i suppose. I used phosphoric acid to lower. Didn't see much of an effect though. Used a capful on a 20lb mash. I think that I am going to start usind saurmalz to lower ph from now on. Without any adjustment however, I was at 5.4. Target is 5.2-5.5. To be honest I was surprised that it was in the target range with no adjustments.
I think it's too bad that everybody's decided to turn on drugs, I don't think drugs are the problem. Crime is the problem. Cops are the problem. Money's the problem. But drugs are just drugs.