And I'm thinking too much N which can lessen your yield. I may be way off base though because i have growing now a strain called Kushage which, for no reason i can discern, is dark green as yours is. And i know for a fact it was under fed. But you are so far into flowering mb it won't hurt. Just cut back N and mb feed a balanced fert for the rest of your grow. Or mb something like 1-12-12. The yellow leaves aren't really a prob. They are being bled for their nutrients and relocated to the rest of the plant, okee dokee?