When do you guys flush ?

Your canopy is already fading, since you are already underfeeding a bit, you are already kinda 'flushing' it as a fade has happened. with a dwc the impact is much faster. 24-48hours will cause additional visible symptoms from an already deteriorated state. You don't flush as long in dwc as you do in soil or even soilless. Flushing is bro science and your canopy isn't strong enough. I wouldn't advise it.