Try to get it looking healthy before flipping, sending it to flower isn't going to help your situation. You look more underfed than over, in my opinion. Don't increase concentration, feed more often-like every 48 hours at least. You don't want coco running too dry. If you haven't been getting any runoff you might wanna flush first, you probably are getting some salt buildup too. Always water until you get runoff with coco, don't worry about how much it takes to get there.