well i would use only hydroten if doing 24/0 or neoprin inserts,no other medium.i would keep your watering just the way it is if you have experienced any problems yet,if its not broken,dont fix it. as for misting,how is your grow set up,the only thing that should be getting any sort of mist is the bottom portion of the roots,see if you can move your sprayer down so there not hitting the bottom,of your RR, if the roots arent long enough to give your self space you could hand water for a couple of days until the root mass gets longer,or fill your system to the top and use it like a regular dwc,once your roots get longer you could drop the water level again and turn those jets on.