Hmm, well theyre definitely too young for the grow big. I would guess it is too hot in there. The CFLs dont seem necessary with the HPS in there. Although not as good as the MH for veg, the HPS works. My MH bulb actually just died, and I am vegging five plants each at one foot. Also, an exhaust is probably the most important aspect of circulation. It also seems that your pH has had some fluxuation. Try to keep in regularly between 6.2-6.8