8 plants 2 weeks old?
Ideally, you would have a cfl within 1-3 inches of EVERY LEAF ON THE PLANT.
You also have to take into account, that when you start flowering your plants, they will double in size (at least - if you flower them before they reach maturity, they will grow even more!). Do you have enough CFLs to cover 8 plants that size?
CFLs are best for growing smaller plants. Smaller plants means less bud sites, but that does not mean less bud. CFLs can still produce good yields. It is just a different style of growing.
I am growing 3 plants and I plan on switching to 12/12 at 2 weeks. W/ 5 40watt CFLs and 4 23 watt CFLs.