Hey man there's a reason they tell you to use both bottles yes you are correct they do not need "alot" of nitrogen in the last phase though nitrogen is a mobile nutrient in the plant it is needed in all stages to maintain good healthy growth and even more so in the later stages to boost the last big of energy out of them fan leaves to make your buds that extra bit bigger. near enough every feed table for every nute company will include nitrogen in the last weeks because it is needed :) nice looking plant anyway almost at the finish here get checking them trikes :) 👊