overfeed or underfeed?

Looks like a calcium magnesium type deficiency but if ur thinking that ur overfeeding them then it's probably got lockout. U need to flush the plant with PhD water at a temperature under 21 degrees to wash away all the salt build up from the root zones.

Rust spots in the middle of the leaves is a calcium deficiency. The rust spots on the edges of the leaves is a potassium deficiency. The tacos leaves is a magnesium deficiency. At this stage you should be somewhere reducing from week 5-6 of flowering at 1.8 EC.

Also make sure your nutrient program gives you more P and K then N. Try 1-2-3 or 1-3-2 ratio.

Hi, stop spraying with that spray product you are using. Lower your Ec to 1.1 and make sure you get plenty of run off. And check ec and ph of the run off to make sure your medium is on point.

Looks kinda normal to me 🙂 Fanleaves usually start to dry out and die, when your plant gets into the late flower.