I just re-read your post and noticed you said something about keeping the soil moist. what i've been told over and over is let your soil dry up. it allows oxygen to get to roots to let them breathe a little.

what i've sorta discovered just by the amount I need to water is that cannabis doesn't like water that much, in the sense that its better for the soil to be too dry instead of too wet. don't quote me on that, but it certainly seems that way.

Your plant is also still very young, so it needs a very small amount of water. I believe I was using about 8 oz. of water per plant every three days at this stage. hope this helps.