I don't understand anything after this
If you make it not able kill hqs it's basically nerfed to the ground, who would even save 325 muni for a delayed airstrike that doesn't do enough damage to kill a hq? Wow it kills everything in a radius, but if we take into account that your opponent has half of a brain, he would move everything he could outside before it even hit.
The more problematic ability is the vanguard air support, since it does a shitton of damage on the first strafe and then just dies to any AA, but it doesn't kill okw trucks so I guess that ability is perfectly balanced
I personally have less problem with the Vanguard strike than the ASO strike yes. People say ooh AA can kill it, I've never seen my AA kill it even with 2x Ostwind Kappa