Ok so I don't have too many grows under my belt, but I've been around it for several years now, and reading anything I can get my hands on, to make each next grow better. I know that some people grow with cfls, and the question is nessecarly about the type of lights, but rather the wattage! The amount of useable lumens that your plants get makes all the differance in the world! I have grown with florescents until the bloom cycle of my last grow. The buds were fluffy, thats when I said ok time for HPS! My last grow was 60-90 days veg on florescents, the internodes on the plant were stretched. I bloomed with a 1000k HPS, for 50-60 days, and the buds ended up fairly tight in the long run, much better then with florescent. I really think that the light is the biggest prob. if you don't want to go to HPS, then get like 10 more high watt cfls, and make yourself a light board or something to maximize plant exposure.
To the fellow that said that he has the same problem, but he grows outdoors. Outdoors buds are always fluffier!!!