I am revisiting this because I feel we missed one small piece of info...In flower your lower-bigger fan leaves start to yellow, because the plant is taking the nitrogen stored in the leaves, this is normal during flower. they yellow and drop off. As a matter of fact, that means you are doing the right thing...Imho. Good, you gave them some flower nutes. don't worry about the yellowing, unless you see it in your buds...as long as it is just leaves that is normal, they fall off and the buds get more nutrition. Imho.lw