Hi mate! My first question is: do you leave the pots sit in the drain after you water them? If so, elevate your pots in a way that the bottom gets some air and don't ever let them sit in drain. If that's not the case, do you water till the water comes out of the bottom? If not, start watering till you see around 20% of it coming out of the bottom. Give them just water for a week, and then start feeding again slowly, don't go over 1.0 Ms EC at this stage. Prefer to water them every day once, in any case don't let go by more that 1 day without watering. A lot of what we think is a deficiency, is in fact an excess of nutes burning the roots. Less is more. Good luck!