UCHQ
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Roots are pretty decently white, some minor brown near the top but very little. I hear you about high EC but that plant is running in 0.2 EC. We are talking 200 ml of H&G plus 100 ml of cal mag for 200 gallons. By serious you mean previous to them exploding or turning to crap?
Your ratio of CalMag to A/B is what is causing you issues. The plants are being supplied with C/M for in excess relative to the other minerals necessary for healthy growth. In your case 33% of your total mineral load is C/M.....it should constitute no more than 15-20%.
Remember, your A/B has ample amounts of Ca, Mg, Fe and N...all of which are also supplied in the C/M your dosing in excess.
I've spoke with the H&G folks and they recommend no more than 1 mil per gallon of C/M if a grower feels it necessary to use. With small plants this can equate to 0.5 mils to supply added C/M.