@CRiSPrGrow, my best guess as to what was happening and why, despite pumping in 4 ml/gal of cal/mag every feeding, is that the cations were latching on to the all or most of the cal/mag as there wasn't enough potassium to fill the sites so the it latched onto cal/mg instead. because my potassium was low strength, the plants gobbled that and weren't able to access it as additional cations that would be reserved for potassium that were instead grabbed the cal and mag. or vice versa
Adding a large amount of potassium and cal/magreleased some cations, replenished it with the excess potassium, and probably stabilized them, which is why there is no evidence of new nute burn at 3.2 ec
I don't know for a fact, but that was my guess as to why and the results "seem" to support that conclusion
like 1