I agree with hty. One 600 hps will kick ass. Just make sure you have lamp at least 2 feet above the canopy of plant. you also need a fan blowing under the lamp and over the canop0y to keep radient temps at bay.

I did a quick read through. I think you said it was cold, or that was mentioned, and that medim wa salways wet. I think that maybe you are not letting your medium dry out enough before you water again.

One question: What is the ppm/EC strenght of your 10-10-10 solution you used to fertilize?