no reason to throw the baby out with the bath water... as long as ur plants are alive, the genetics are intact. Soil doesn't seem to be ur problem, you could have some pH issues, who knows.... but, obviously, lighting is ur biggest issue. those lights look totally undersized. you should at least have (3) 4' ft 2 bulb flourescent fixtures over them 6500k bulbs straight up (switch to 2700k spectrum for flowering) ... like was already said, withing 1-2 inches of the plants if not slightly touching them.