Gorilla Zkittlez & Sour Diesel

Things are chugging along. I am selectively defoliating the core to open up more bud sites. The RH is becoming a minor problem. I have noticed on some fan leaves there is sitting water due to lack of airflow and the plants transpiring. I do not want to introduce any mildews/molds into the tent. I have officially ran out of room so i truly hope the stretch has ended. It seems as though I have gained at the very least an inch a day for the past two weeks. I defoliated the base and anything that is not going to reach the top of the canopy. Going forward I will be monitoring for light burn and attempting to bring the RH down. Sour Diesel has shown very slight signs of nitro toxicity - this is evident on the curled down fan leaves. I have taken the grow big down by 5ml Gorilla Zkittlez is still just chugging along and taking whatever I throw her way. Today of all days she does not look too well. I am unsure what is causing her to droop(probably VPD related).