This might be a noob talking, but the last time I burnt my plants, I just backed off and let them deal with it. Didn't flush, or anything. The plant recovered and used that was in the coco and then I just watered with feed again as normal. Putting extra water on your plants will only stress them more, imo. This is my first grow, and I make a lot of mistakes, but I feel like I've been learning a ton every time I make a mistake or try anything.