You're stem looks a little scrawny. Id suggest getting a fan blowing on your plant if possible. Dont need anything big, a cannabilized computer fan would do the trick, basically getting any kinda a "breeze" on your plant will tell it to develop a sturdier stem. Also it looks kinda like its stretching (sativa plants like to grow up rather then out). Try and get those CFLs in a bit closer to your plant if you can, that will encourage it to stop stretching so much and grow bushier.