Deficiency, nute burn or under watering?

Nitrogen toxicity seems fairly obvious. I would correct that first before going any further. One of the biggest issues that I see are people overcorrecting and causing a whole host of other issues. Test the pH and EC of runoff if you can. If either is way off from the measurements of your feed, then it's a nutrient problem. I'm not seeing the classic signs of underwatering. No drooping or anything that leads me to believe that she's missing water. Also seems like you're keeping a close watch over it. Good luck, hope this helps a bit!