I need help!

I have one w. rhino and three bagseed plants growing under CFL's. I am mixing flowering and veg rated bulbs with each plant over 200 watts. They are five weeks old and are only three inches tall but have multiple leaves and are very healthy looking. The soil is Sta-Rite for flower/veg with nitrogen. Everyone else at this age is six to twelve inches tall? Anyone help with this? I checked ph and it is around 7.4 from tap so I have been dropping that to 6.2 before watering now which sems to be helping. Any input would be great. I think I will switch to HID lighting as this seems to be taking long time with little progress.
 
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