Nice looking setup you have there, but I think you are going to need more light for the flowering stage. I grow 4 plants in a 75x75cm tent under 2x250w 2700k CFL's, they are not autoflowers, but I try to keep them under 2ft tall because of the poor light penetration of CFL's. I veg my 4 plants under 1x125w 6500k CFL so you should be ok with the light you are using for the veg stage.

I am going off high watt CFL's for flowering, once you get to the 250w and 300w versions one of the main advantages of CFL's (low heat output) is greatly diminished and you have to have extraction similar to that required by other types of lighting.