Nutrient lockout/ possible nitrogen toxicity

My plants been acting weird since week 4 or 5, I found out through flushing them with ro ph water. At first my oh was off and was too low. After I corrected it, the problems still didn't go away. I suspected that my ppm/ec was too high and that my salts had built up too much. I noticed that whenever I gave it lower feedings and less food the more they reacted better. Now I'm in week 8 and still having problems. I'm giving them 18 more days til day 70. Any recommendations anyone. Not sure how to do. Or if I should even feed anymore. I am using Athena blended , all led lights , and mother earth coco. Not too sure about the coco I'm using , but I suspect it is causing problems

any pictures, a picture paints a thousand words

Yes ill send one r now

How’s your ph? You mentioned coco, are you using calmag?

My phone has been stable now..its about 5.9-6.2. About 3 weeks ago it was around 5 . Yes im using mother earth coco. I've never had this problem before. I was ph at 5.8 and it still was at around 5 . So now I ph at 6.2-6.4 so it doesn't fall to low

Ph*

If your Coco gets too dry the ph can drop I think

Not sure what happen, I always fed but still trying to figure it out so it doesn't happen again