Do you have a computer? Is it on all the time?
A new computer gets turned on and left on 24/7 every minute. Most desktop computers have more than a 350 watt power supply. Add two mointors and speakers, perhaps a router too, and that right there is the equivilant of your grow lights. With the amount of electronic devices out on the market. Electric companies dont waste their time when someone starts using 1000 extra watts an hour. You think the electric company tips off the cops every time someone gets a new electric dryer, fridge, heater, ac, or stove and plugs it in?
If you are that worried about your electric bill, then replace ALL the lights in your house with CFLs. Dont turn lights on when you walk into a room to grab something. Crap with the lights off and the door open. Unplug your cable box, tv, dvd player, and all other electronics when not in use.
From what i have read. The people around here are warming up to CFLs for cloning/seedlings and veg stage, but still recommend HPS for flowering.
I say, keep the CFLs (what color temperature are they and how many actual watts). Your prob may be just the way you have the lights arranged.