DO NOT PH YOUR SOIL MIX TO ANYWHERE BELOW 6.3!!!!!!!!! I CANNOT STRESS THAT ENOUGH!!!!!! 5.5-5.8 IS FOR HYDROPONICS ONLY!

All your fan leaves yellowing and falling off is not a good thing. Your plant is telling you that there's a problem.
FF soil mixes only have enough nutes in them to last maybe 2 or 3 weeks for a medium sized plant. Have you given them anything besides the EJBB? If i remember correctly, there's no Nitrogen in EJBB. If you haven't added additional nutes with N, there's your problem, she's starving and cannibalizing herself to survive. This will affect both yield and potency in a negative way.