Dirtbag
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i find it easy to water too often and the stuff holds on to nutes. I thought i was watering reasonable dry cycle and feeding ok at 1.4-1.5 to try to correct the yellowing. After a couple weeks i just flushed an extra gallon of water through the 3 gallon pots and re fed at 1.2 -1.3 ec and everything started to get better in a couple days. I overfed and got buildup that did not show on the ec meter. Then the runoff actually goes down. But that is salts attracting salts not the hungry plant it seemed.
My best guess anyway. Hope you get it figured.
Thats the biggest lesson with promix, is compensating for how much nutrient it holds and actually reducing feed rates significantly once you get into mid flower. Overdo the food and it can be hard to detect with meters, and youll be chasing ghosts. Ive even dropped my ec back to 0.8-1ec after the stretch for weeks 4-8 with excellent growth, no yellowing.
Less really is more with promix.