My pH has been drifting up as well. Here are my numbers:
TA 80 (it was at 70- I mistakenly raised it with Baking soda thinking since TA buffers pH, more would be better)
Salt 2090 (no SWG)
temp 82 degrees
Even though Pool School recommends TA from 70-90+, it sounds like you are recommending lowering TA to 60 and possibly even as low as 40 to try to stabilize pH drift. Is that correct?
My question, then, is how to effectively lower TA when I have no aerating features and no eyeballs on my returns. One of the 3 returns barely ripples the water about 6' away from the wall. Will lowering pH to 7.2 and letting it drift back up naturally bring the TA down? Or do I need to find some way to aerate the water?