@h1aaawYou didn't get a direct hit with the NNEMP, on a direct hit you can expect ~30-55 damage depending on the vehicle (jeeps and civilian vehicles excluded). I'm not sure but it's possible the bombs also have directional damage as well. That being said, yes, it's depressing how long it takes to grind this vehicle's equipment and how it doesn't even have the jammer in the default loadout. The point about casual players is very true, it's supposed to be a casual game, the vehicles should at least be usable by casual players.
Expect mild disappointment from the kerosene bombs.