Help with leaf problem… possible nutrient lockout?

to add onto my previous answer, If you PPM is down to 450 that's 0.9EC if on the 500sclae, or 0.64EC on the 700 scale. Best to use just EC and fuck PPM, dive the ppm number by the scale your meter uses, Mine uses 500ppm=1EC 1EC is always 1EC on any scale but ppm's are different. I think you need to give it some space for the soil to adapt. Keep adjusting the PH down in the water to aorund 6.4 your leaves are looking like they having some issues with PH flux and could use to extra K. Soil will always balance the mediums PH and it is not as static as hydro grows. Mixing in Peatmos will help keep the PH lower as well as sulphur, its broken down into sulphuric acid and lower mediums PH that way. With all the flushing it might be good to offer a Microbe infusion to help replenish the population. But i feel the roots need some time when they are not soaking wet. Good Luck!