I think an investment into a grow room is a good one for a couple reasons...
-Equipment gets re-used, so your first grow might cost you like $300 an ounce lol, but subsequent grows will cost little more than the price of electricity and fertilizer!
-This is so corny... it's a hobby... look at what people spend on like craft supplies and such... hahaha it's entertainment if you are a garden geek like some people!
Yeah Orangeman the ventilation is something that will repay you well, and I'd like to suggest that your next light be air-cooled- I waited 3 years for my first air hood and was like, WOW, I'm a dummy, it would have solved a lot of problems!!!
On the topic, mites breed and go thrrough their life cycles REALLY fast in higher temps and an infestation can get out of hand faster if you are up in the 80s. IF you HAD mites yeah, the damage may continue to look like it is getting worse as the leaves scar up, so just look for signs of FRESH damage and the bugs themselves, and even if you don't see any, a good bug-bombing a week before you initiate flower, and then another one a week later, is GREAT for your peace of mind.
The plants are looking very nice overall. If I were going to make one suggestion, it would be to train them out a little flatter to use the light more efficiently. See how the lower parts of the plant are in the shade? IF you spread out the canopy, you will have a little better penetration, and you will be giving yourself more room for when it is time to flower.
