I think the FFOF probably has more nutrients. What you MAY be seeing is a CalMag deficiency, but it's impossible to tell without pics. However, my buddy at the hydro store was telling me that if you add an extra 1ml of B, it should fix that up. Notice, if you feed the exact amount of A&B every time your bottle of A will be gone quicker than the be. Shake your bottles, you'll probably notice a difference. Also, if you haven't already, hit them with the Magic Green from H&G as a foliar. That shit is literally magic in a bottle. Hope that helped.