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You already did exactly what I would have done. Raise the pH of the water you putting into it. Just keep checking the water that's going in and coming out of your soil to make sure it's staying in the range that you want it.
In all honesty I never even check the pH of my runoff or the soil itself. Just the water that's going into it.
-------------------- Dude she isn't as young as she use to be.
I've checked the pH of the run-off from my soil and it's always so high that it's off the chart. My tester only reads pH 6.0 to 7.6 (yellow > green > blue, aquarium style) but the run-off always turns blue after just one drop of the 3-drop test solution that colors the water.
I don't sweat it. I've been watering with approx. pH 6.2 tap water and things have been looking just fine for me. Besides, the only reason I bought the kit was to test the water going IN anyways as most everyone says that testing pH of run-off water results in an inaccurate measurement of the soil's actual pH anyways.
Have you always tested the run-off and did the appearance of the symptoms coincide with the drop in pH?
Either way, you say you're a month away from finishing and it's said that a good pH balanced flush will remove wastes and build-up from the soil so hopefully that'll help clear things up as well. I wouldn't sweat the run-off numbers too much though. Just my friendly, INEXPERIENCED observation.