Check the reservoir pH at several times in a day, right after watering/feeding, rather than after a few days.
As plants take up nutrient ions, they emit compensatory ones, which is bound to change the pH. Then there’s the fact that the plants have different chemical processes happening in the daytime and at night, which may also have an effect.
The bottom line for me is (relative) simplicity: know what’s in my water, add what I want, and simply don’t worry about the pH.
Small variations in pH have negligible effect on the plants or nutrient availability, and unless you do something to shift the pH to extremes, it’s sort of self regulating.
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