I don't think you used enough fertilizer, imo. General Hydroponics Flora Trio is the only nutrient I know of that that 1/2 strength shit is true. Because half strength is almost always the edge of burn. I got some Gazzurples going RN. 1000W HID and some big girls.3 ft tall now and about ready for flower after they get a little bigger. Started in 1 gallon and transplanted to 5s. Plastic grow bags, fabric are trash and dry out too fast and all the problems that come with it drying out too fast.