@tripaholic88 how much ph water did you use? I have found in coco the nutes do indeed build up. They stack in layers is the only way I can explain it. Its possible that the roots have gottin deeper in the pot and are hitting salt build up. This is just speculation from years of coco growing. I didn't notice it in flood tables. But that's cause I'm always flushing just to over flow when I feed. In pots though.... ugh.
I am going to start feeding heavy in veg and try way lite in flower. Well until the plants say give me more.
Enzymes, I figure would help. Hut I have no experience with any.
When needing to flush out salts in coco I take um outside or to a place I can let them drain off. Then I flush with atleast twice their normal feeding.
To avoid the problem you could try alternating food and ph water.