Can't stress enough that I should have been on top of this from a preventative stance.
LayedBack : I think there is something keeping the turgor pressure from getting to where it needs to go in your plants..Keeping them from transporting water through the vascular system properly ...I think your plants are pulling the water up in a trickle instead of in hyper drive like they're supposed to be. A foliar spray of potassium silicate and calcium nitrate..that should get them going.
What about the EDTA in Cal-Mag?and hitting them with Cal / Mag