I'm not saying you need to buy anything... just turn off the HPS and run just the CFL's in veg. HPS is expensive to run so at least for me, I only veg under CFL's and then use the HPS purely in the flower room. I still get really good veg growth but it doesn't cost as much and I save on using the HPS bulb... they wear out after all. It's not like you're doing something wrong. IMO you're doing something excessively expensive for no reason and the only change you need to make is to unplug 1 thing. You've got the CFL's already right? And they're cheap to get more of right? I'm on a budget too but I don't waste money on running lights I don't really "need". Sure my veg period may end up a week longer but drawing 1/10th of the juice.
many people burn their genitals with soldering irons for sexual pleasure but it's not really the best idea. Commonality doesn't make it correct.