Nevermind.. Walmart soil with miracle grow, and then meal additions in top of that?
You've likely got a nutrient imbalance that's overloading the soil and locking up nutrients.
Kinda hard to reverse that one. Especially if the miracle grow is slow release like it sounds it is, and the plants are rooted in. That's also way too much blood and bone meal.
I know what I would probably do.. but ill be damned if I'd advise you to do it.
I'd get good quality soil, not add anything to it, then cut away the fabric pots and rinse as much the old soil away from the roots as possible, as gently as I could, then re-plant it in good soil ultra carefully. It would piss them right off for sure, but they'd be happier in the long run.
Alternately...I'd maybe just try and reset the CEC by flushing very slowly with something like florkleen or
clearex, or a homemade version. But those organics you added will be impossible to remove with a rinse, so I don't really know. Enzymes possibly.. but yeah. Not great options.
That said, I'm curious to hear if anyone else that grows in soil has other ideas for treatment.