I have my lights 11 inches above my plants.I stoped misting because I found one of the plants lost all its dew because some mist got on it.
Dose the Dew come back in the morn before the lights come on ?If so its your lighting system.
Maybe you should try to make a CO2 maker . Maybe there not getting the co2 they need? A co2 maker will only help your plants and cant hurt.
Look for a post called CO2 that may help.