I got an idea.. This "blue" shockwave seems to be the result from the energy systems.. But, what if you tackle on the small red shockwave from the first shockwave dilly in the other thread DaB? That will give off the effect of the "combustion" part. But, simply make the red wave more "firey" in nature. Not like a simple wave, but make it look like a wave of fire. Blue shock wave from the energy/power, red fire wave from the igniting fuel.
Though yea, you gotta keep the original explosion. That's where the red firey wave comes in. It's the fire getting pushed outward faster.
I dunno, just an idea.