I would also recommend moving your lights a bit closer, the space between your nodes is a bit more than it should be as this stage of growth.
One last piece of advice, I would just water by hand. A watering system like you have is either for hydro, a MUCH larger garden where you can't access every plant or SoG. For soil growing it is better to give them a good soaking and then let them dry out a bit, rather than just have a trickle going. You need to make sure that moisture is getting to every part of the pot, not just in the root zone.