They are transpiring the moisture, and there is not enough hydraulic pressure remaining to support it's own weight.
I'd get a couple of chop-stix and a make a 'baggie tent' for each one if you must, but keep 'em covered, which raises the plants ambient humidity.
Quit spraying them directly, as this can clog the pores preventing proper O2:CO2 exchange in the leaves. Spray the soil (cube, puck, whatever is used) and the plastic cover, but not the plants.
Keep lights further away from rooting clones than with rooted clones. The idea is to promote root growth, not foliar growth.
I've found a 18/6 light schedule works better than a 24/0 schedule for rooting clones. Well, actually I think it's better, period.

My well water out of the tap has more vitamins and minerals in it, than a 1 drop per gallon dose of Superthrive. (at one drop per gallon, it's approx. a 50,000:1 ratio) Same with that VF-11 crap. But perhaps the hormones in the Superthrive helps the clones a tad. Just don't overuse the stuff.

I've used Schultz Rooting Hormone powder with great success for many years. Just a light dusting though. More is not better. Same with dipping in the gel rooting stuff. Just a dab will do ya.