There's evidence of heat stress there among other things.
I'd flush at 6.7, feed immediately with your bloom fert mixed 1/2 strength, foliar feed ONCE ONLY, with a micronutrient supplement that contains a little N, such as GH micro, mixed at 1/4 strength (you have N and micros def too early for a plant that is supposed to go another month), then let the plant get rather dry and pot-up into a larger container if the plant is more than 3 feet tall. If you don't pot up, at least check that the 5 gallon pots have enough drainage in them, and go back to feeding your primary bloom fert at the recommended dosage. Lay off the supplements for now.
Also raise your light to about 2 feet until that leaf curl stops and check that your ventilation is good.