2x Blue Zushi / 1x Zombie Kush / 1x Blue Cheese

I have changed my schedule, the plants have been repotted earlier because I will soon be away for a while and the Autopots will be doing the watering. All the plants were topped before repotting. The substrate now consists of approx. 40% perlite 60% soil. The 60% soil consists of 50% old soil from the last grow and 50% new soil from Plagron. Unfortunately, the plants are not developing as expected. During the day the VPD is between 0.8 and 0.95. But at night it drops to 0.4. I will probably put a few additional heating mats in the tent, which will only run at night to counteract this. For your information, the tent is in an unheated room. My problem child is the Kombie kush. It looks like it is getting too much water. But I really only water it when the soil is dry again. I think the drooping leaves are caused by the high humidity at night. The Blue cheese also gets light spots on the new leaves. I have never had this in my grows. A lack of nutrients should actually be ruled out. Perhaps a PH problem? Please ignore my selfmade space booster made of cardboard haha