This is an issue for both High Explosive and Anti-Vehicle grenades/rockets/missiles. It seems that the assumption made was that a boost to AR compensated for lower DV, which is a truly goofy assumption considering the AR doesn't help with your to hit dice at all (outside of getting an edge, but I'm not jumping on that grenade again).
Anti-armor explosives should have and insanely high DV at ground zero (18 DV for High Explosive grenades/rockets/missiles, 20-22DV for Anti-vehicle rockets/missiles), then a massive drop-off at close and near ranges, and with a gimped blast radius.