Plain you're on the right track there in a way. Boosted cars typically run lower compression ratios yes, but only from the factory. I can explain it for you guys in a quick and simple way (I can do further explaination in detail off this topic tho if you message me).

Lower Compression Ratio = Less Torque = More Boost that can be achieved "safely" without Knock on lower grade fuels = Lower engine temps

Higher Compression Ratio = More Torque = Less boost needed to make the same power, BUT requires a higher grade fuel to keep from getting knock (to a degree) = Higher engine temps.

Keep in mind tho guys, boost is NOT the measurement of power, boost is the measurement of restriction, so more boost does NOT always mean more power. More boost giving more power is only when you've maximized the flow potential of the engine and it will not flow anymore and you want to add more to it.

Cobaltftw, you can go with the .040 HG, it will bump up your compression by like .03 or something like that. It's not a lot so it's not even something you should fret upon a whole lot. Just make sure you do a good amount of logs to get the tune back in touch with reality. Any slight bump in compression means you really only need to add a little more fuel and possibly take a little timing away at first then you can bump it back up as you log.