I think you'll come to love the waterfarm. Ive been using them for a year and a half now and I think they are the greatest thing(for beginners, and yes i realize a grower with experience under their belt can build their own system). I would advise you not to use ANY nutes until you see alternating nodes, just ph your water. From the size of your plants, it looks like your growth should take off pretty soon. Each persons grow experiences are different; My waterfarm growth is always slow at first, even with ph'ed water, but really takes off at about week 3. I wait until the plant shows sex in veg to switch to 12/12. To me the overnuting is cause for your slow growth, PH'ed water should straighten things out.