As well when did you mist your plants... I hope you did it while the light was off!!! as well allowed a few hours of darkness to pass before turning the lights back on. I usually Neem right when the light goes off. so they have a good 4 to 5 hours of drying time.

Droopy leaves can be caused just by watering. I also try to water when the light is off. I find the plants take it in better, As well it insures that excess water that might fall on the leaves drys before the lights come back on.

kd