Your first picture is very telling. Do you see how the water is sort of pooling along the veins?

I suspect that your foliar solution is pooling and as it dries it gets concentrated enough to burn the leaves.

I would hold off on foliar feeding for a while.

When you resume, try feeding with the lights on, with a surfactant and weaker solution, so that the water evaporates before it has a chance to evaporate, and doesn't bead up.

The last picture shows a bit of nute burn on some of the lower leaves.

On the up side, those are very nice bushy plants!