For starters, the 67W only is 67watts, not 500. Regardless of what the box or w/e says. Also about your other CFL's. Do they work for you? As in do you have the proper ballasts and all that? I'm just gonna go ahead and assume you do. Also, we need to know more about your grow area so we can properly assess things better for you. Also pictures would help a lot on the area itself. Otherwise in terms of lighting I think you are doing really well. I'd also like to know the Kelvins of the bulbs. Also, instead of just adding the HPS during the flowering stage I'd recommend using it with the veg too if you can keep the area cool enough. Goodluck and welcome to the forums.