Since it's obvious your medium is loaded with fertilizer, I'd give it a good flush with 6.4-6.5 pH water to reduce that first since I think it's your main problem. Let them dry out pretty well before watering again, maybe with a 50% nute charge for a bit. Also, since you've been watering quite a bit, put a fan low around the pots to help they dry out quicker. They may droop a bit, but in a day or two they'll pick up again. Go easy on all fertilizer until it gets bigger.......