i just noicticed the cfl's you are using i would advise against those as i have looked around at these lights and i found those phillips ones to be not that good i will show u a pic of my plants tommorow under 4 cfl;s totaling 350 watts i noticed you are in australia and so am I (can tell by the avitar, nice torana =P)
i found some good cfl's at bunnings and the warehouse supprisingly, look for ones witha rating of 6500K and a high luminious efficentcy. my plants seem to be about twice as big as yours and mine are only 18 days old, but this is my fourth or fifth time using cfl's and oh the mistakes i have made not one plant made it to flower yet =(, I aint nokking your grow thou for a first time they are looking great. i will post pics tommorow for your veiwing pleasure....lol peace