Your CFL's already have almost the same range of blue, but their red peaks at about 610nm, you'd be alot better to try to find a red heavy tri-band bulb, like a colormax, florasun, or aquaflora. Your cfl's have a good dose of blue within them and naturally have a decent spectrum, blue/gree/red, but the reds are a little low for good PAR response (sure it will work but you want whats best right)
Any bulb you can find with a red peak over 620nm would be a good addition.
btw those look like 6500k's, not 2700k?