As far as I know, higher Kelvins is better for Veg, Lower Kelvins better for flower. Different light spectrum's. Either way, your plants will grow, just not to the potential especially using CFLs.

I could be wrong about the Kelvins, so don't quote me on it, but I believe I am right. But lumens isn't the only important thing when using CFL's. I have a CFL grow going right now and they seem to like my higher kelvin rating (6500k). Your cfls should be 2 or so inches away from your plant, literally.

Pictures of your grow box would help as well to determine how effective your 2 42watters are. As well as pictures, one would probably say your plants are far too deep in the cups too. Although your probably going to transplant sometime to larger pots, I hope, you should let the soil sit for a day or 2 to let it settle down, or water it thoroughly to allow the soil to settle down. Before you add the seeds or plants, once it is settled, add more soil so the top of the soil is much closer to the top of the rim of the container.