Just reviewed the thread again.
Heat and too much nitrogen are combining to give the dull, lifeless, appearance to your leaves. Be very careful with superthrive, because it adds more N than you would like in flower, and I'd use it next time during veg if you like that idea. A silicate supplement like Silica Blast is something to consider, to help your plants tolerate higher temps, and you want to add humidity to about 30-40% rh.
You don't need to foliar feed. But a foliar treatment with SMC leaf wash would help restore the glossy appearance and keep the leaves from losing moisture so rapidly in the dry air. It's 100% safe to use in flower and has a sweet, agreeable scent since it's just coriander oil. Smells like prep time at an Indian restaurant, lol!