I don't know soil growing but according to my grow bible, yu are actually having either a P or K deficiency. Since yu are giving them those very nutes makes me suspect that either yu are not giving nearly enough for the flower growing which will rob mobile nutes from the leaves or yu are having a nute lockout for some reason. Go back and have a close look at how to feed with those ferts. (a stupid question for ya.) are yu sure yu are giving them tablespoons (Tbsp) and not confusing that with teaspoons(tsp)? I did that one time on my measuring cup. I was looking at Tbsp and thinking tsp and gave way too much, and had to seriously dilute. Yu may need to up that nute regimen considerably.