you must be experiencing nute lockout.
I'll take a guess and say overwatering is locking out nutes

young plants need no ferts till 4 weeks and you have given them a ton of stuff it sounds like, and they dont seem to be taking the nutes.

instead of more watering, try to foliar feed the plants with your mister, dilute the ferts 50% and spray both sides of they leaves.

resist watering as long as you can (when the plants droop)

I'm curious about the soil, the name "StayGreen" caught my eye .Is there ferts pre-added to this soil?, and if so whats the NPK rating? are they time released.