So, at the end of flowering, when the ppm ranges increase, I just add the appropriate amount of PBPB?

PH I check every week or so, water comes in about 7-7.2 and run off is 6.4-6.6. I just use dipsticks which I hate, I need to get a PH meter that has a digital read out, I always worry that I'm not reading the test strips right.