Nitrogen Toxicity? Need Help!

[Waira]

... that weird patchy necrosis isn't nute burn, nute burn will pretty much always start at tips/margins and burn inward,... that particular necrosis I'm not entirely sure about, I see it mostly in hydro when there's been a sudden pH shift,... it stops, and dries and stabilizes after pH is fixed usually,... Divine, I see what you mean, fungal spotting can kinda look like that, but almost always, there's a "wet" browning to dead tissue, along with a yellow perimeter with active fungal/bacterial attacks,... TF, did you ever get a soil pH done, even a crude run-off test would hint at what it is,... if you flush, 2-3x pot volume is typical,... you can test that first few onces of run-off for pH, TDS/EC too if you have one,...