LED lights it looks like? How far above your plants? Any idea of the strain?
They need several more weeks. Back many moons ago, I use to use Miracle Grow on my outdoor plants, along with some other generic stuff designed for vegy's, and actually grew some amazing plants, but I was also using other organic material.
I'd move your lights closer, like 10-12" from the canopy, and maybe give them one more dose of MG, then just water the last few weeks. Next time, some bigger pots....at least 3 gallon, 5 or 10 gallon is better.