This looks like classic nutrient lockout. Most likely due to over feeding. OF should have enough nutrients available for the first month or so right out of the bag. I would need more info in how you got and tested the runoff. I have never seen the same number go in, and come out, when using soil. I would also need more info on your feeding schedule. When did you start using the MC? Are you feeding every time you water? Adding recharge to soil is just like feeding it. The microbes break down the organic matter in the soil and make nutrients available to the plant. Im pretty sure the instructions say to reduce your feed if using any with recharge. So you are feeding the plant from two different sources.. The mega crop, and the soil. I see plenty of plants grown with MC and soil/coco that are fine until flower, the the train derails. When you check the run off, use RO water with zero ppms. And run about a half gallon to a gallon through the pot. Test the ppms from the last few pours.. After the entire pot is well saturated. There isn't much you can do to correct it at this point. I don't mean to sound like a party pooper, and I hate being the bearer of bad news, but based on those pics, I can't see the plant making it to harvest. But what you can do is try to pinpoint the cause and use this as a good learning experience. If you are a new grower, I would advise making a post at the very first sign of any leaf changes or issues. The earlier the better. The plants are feeding off of the nutrients in the leaves (cannibalizing) because of the nutrient lockout. In a few days/weeks, there won't be any green leaves left for it to feed on. So the lock out must be found and fixed for any hope.