A. Check trichromes if they're glassy, let it keep going until they're more milky and amber, unless you like jittery anxious weed?
B. Pluck off a small bud dry it and smoke it and test it out.
C. Check breeders recommendation.
D. It's your dang weed, go with your instincts as you can see and inspect it much better than all of us. 😉
Watch for the hairs turning colors and curling inward also swelling. If you're at 7 weeks of flowering, I feel like most strains are around the 10+ weeks of flowering, so possibly go off that as well.
P.S. I see you use foxfarm, I too suffer from heat and I use their boomerang supplement to help with that and it seems to work fairly well.
Happy healthy growing the plants looking great so far.