How are those ceramic watering sensors working out? I was looking at picking up some of those..pretty much the same setup, 400w coco in smart pots. In reading reviews on other gardening sites they recommend having the reservoir just below the sensor or they overwater but everyone here seems to hang them. How does the coco feel? Is it damp continuously? Is there any runoff? How do you control the rate of drip? I thought they just activated when they became dry and stopped when they got wet again. Are you using drip clean also? If you're worried about your plants getting too big when you flip them to 12/12 check out some bushmaster...I've heard good things about it but have never actually used it myself although I might call and try to get a sample.