I am not positive about this, but make sure your cfls are an inch away from the plants. Any more than this will cause the stems to stretch for the light. I would also check the ph of the soil as high/low ph can stunt growth.
I grew hydro a few cycles about 5 years ago. I know a little about this stuff but I am not an expert by any means.
I am also throwing out some lowrider #2s, Northern Lights, and chrystal for my return to the science. Good luck with your grow.