You will want to keep these short and bush in order to maximize light. Consider LST or tying them down. Check out this link for a tutorial. I'm not a CFL person so I can't give you accurate advice but if I had to say something, I'm thinking you want more light. Check out the El-Cheapo Guide to Lighting sticky in the indoor lighting forum.

Yes. time to switch to 12/12 flower. You can expect those plants to at least double in size and perhaps triple depending on the strain. Good luck!