Just running full tilt schedule, fully let part a dissolve into your res then add part b for veg and Bloom, give it a few minutes add slowly and take your time stirring, I have had zero pH fluctuations since ditching my airstones and just hand stirring before each feed.
Add part A, let it sit 5 min, hand stir really well, adjust pH to desired, then add part b, handmix again then let it sit and check pH again then mix and pump.