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Plants are looking good bud! I note the back plants are taller so closer to the light, but also what Litit mentioned about the heat on the sides. Also much easier for air to become stagnant between two objects, if you packing plants all along the wall you gotta leave a space between them and the wall aswell as in between them. If you add more plants you gotta add more fans aswell, but usually it's best to stick to keeping a space nice and "open" to play on the safe side. I always aim to fill up my space, but when I say full I mean 90% max and that's including a fan, 2 fans for flower room and I only run 1mx1m spaces. You right bout that space being a bit too full, gotta make sure the fan is able to get to all areas. Fresh air exchange and circulation is incredibly important, undesired VPD range can make a good light cause light issues, even though it's not the light itself that's the issue. If vpd is out -> plant stomata not acting right -> abnormal transpiration = easier to get hurt by light and/or humidity Is this in a tent or a closed space? When you say intake fan, you running on a positive pressure? Grow rooms run better at negative pressure, you gotta suck air out. If it's a sealed room you gotta have same amount of air going in as you got going out and a big must to monitor CO2. If it's a tent or a non sealed room the fact that it's not sealed will allow passive intake.

Curling would be heat and the texture is light stress. They might be to close to your reflective insulation at the back there.., the material is awesome for maintaining heat but without the airflow that insulation gets hot pretty quick. As for what to do, cut the effected leaves off, move them away from the sides and add some kelp extract with water for the stress relief. (It's what worked for me anyway. I use the same lining in my flower room.) Happy growing and GL

Do you have a cheap hygrometer or something to measure environment? What are the temps and RH? If air circulating is a problem, find a generic fan in your house or get a cheap one to blow under the canopy and move around what I assume to be humid, hot air.

Chop, chop....

Buds dry enough to pop off main stem, but still bounce back. Did a final trim on some of the smaller leaves, and now curing one batch. Other branches need a little longer. The bud is leafy, but I'm quite happy. Still have three other plants I'm letting flower for longer before harvesting.