Im not familiar with the nutes you are using but i think the general rule is veg nutes for veg and flower nutes for flower. Start bloom nutes when you see preflowers or the little whites hairs coming from the calyx. I personally dont see a nitrogen def. That doesnt affect a leaf here, a leaf there. Just by looking at the pic (the little drooping) i would personally question watering. Too much or not enough will make a plant look sad. Just my 2 cents