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Full disclaimer: I haven't read every post up to this one. Redundancy possible. First I should say that the images don't indicate root rot to my eyes. Roots would be coated in an obvious slime and they'll slough off easily. Give a root bunch a very light tug. Root rot usually develops thick and...

I'd wager his water levels dropped in the 48 hour period (plants move/transpire more water in flower) and thus increased the salinity of his reservoir. And/or his EC meter was off calibration for one or both of the data sets. Cheers, MM

At 3 weeks into flower, your plants are hungry and taking up (out) the P, K, and trace minerals from your fresh res, causing the shift in your pH. Try gently raising your PPM with bloom nutes, or 'spoon feeding' with K and/or CaMg. This assumes there's nothing nasty going on at the root zone.