Sudden mottling and yellowing of leaves overnight. Help!

Im growing outside on a balcony in a 15 gallon fabric pot using Roots organic soil. Soil pH is about 6.5 and it is getting age old grow 12-6-6 to the bottle recommendation of 2 tablespoons per gallon. Same with Cal Mag. I spray every 5 or so days with Einstein oil but that is about the extent of my pest prevention thus far and it has done me well. I just noticed this morning quite a bit of yellow fading and brown mottling on some of these leaves and I was wondering if one of you more experienced guys could tell me what you think is causing it and how to fix it?

My current feeding schedule is a 3-day process day 1 and 2 each 15 gallon pot gets two gallons of nutrient water Phd to about six and a half. And on the third day each plant gets a flush of anywhere from 5 to 7 gallons. I just put these plants in tomato cages yesterday which I think caused a bit of stress. Other than that I'm not sure why this mottlibg and yellowing would be happening but I'd like to reverse it in due time if I can so it doesn't get worse.

Most Important: how do I fix! I feel so bad for the poor girl

I see calcium deficiency(those brown dots) and beginning stages of N deficiency(that yellow fading). Calcium def starts on top. N deficiency starts on bottom. Do you have a ppm/ec meter to test your runoff?

do a slurry ph test. looks like somethings getting locked out