Have you ever checked the pH of the water your using?
I mean your plant doesn't look like it has pH issues, but I was unknowingly watering my plant with water with a pH of 8.2 - once I corrected the plant took OFF! I attached a pic of my plant that I had been watering with a pH of 8.2
My friend had a plant like that under 3 or 4 CFL's, and and it looked like your plant after 3 and a half weeks. (no offence I'm just comparing)
Also, I would go get some socket adapters at Lowes (pictured below), and then go to Wal-Mart and look for a 2 pack of 6500k CFL's for $6 each, I'd reccomend at least 4 for a plant in veg (I used 8 for two plants) To identify the correct light bulb, it says on the front of the box 6500k.
Your plants will love you for that, those socket adapters cost like $2 each.