Brown spot in early flowering

this is not N excess it's plain Ca def

It's text book magnesium deficiency mate there's no doubting that.. You can cross check on a deficiency chart, Epson salt or calmag for that dude👍

Looks like she’s still recovering from the earlier nitrogen hit. Those spots could be a touch of calcium deficiency showing after you lowered EC it’s pretty common when the feed gets dialed back fast. Keep your pH steady and slowly raise EC around 1.0–1.1, then watch the new growth that’s what really tells the story

Those tigers strips on the leaves along with the spots is definitely a magnesium deficiency, The dropping of the leave is telling me over watered or too wet for too long causing root damage,, possibly,,, best way is to let her dry back properly and give some Epson salts or plain old Calmag.. Apart from that they look fine... Always have a wet dry cycle, oxygen in the rootzone is as important at water etc... Also make sure your watering in the correct pH range.. Best of luck.. Grow on growmie