My plants looked similar when I was over-fertilizing for a few weeks during veg. The leaf curl, yellowing, brown spots/edges. I dropped the EC to 0.8-1.0 and it went away, especially the leaf curl. I still have some damaged leaves, but nothing new is popping up.
I gave a weak solution at 0.2-0.4 EC then next watering gave them the normal 0.8-1.0. I also get around 20% run-off per irrigation and I almost never use plain water. FWIW, there in Sunshine #4.
You should check the EC of your run-off just to make sure its not overfert. With my plants the over-fert was causing an abundance of N and K which would antagonize other nutrients and basically started a chain reaction because I did it for so long, I saw deficiencies of N, P, K, Ca, Mg, and Fe. They didn't get better until I changed the nutrients from a 4-1-5 to a 3-1-2 ratio and lowered the EC. Good luck.