Title says it all .... 1 HE rounds doesn’t do enough damage to a logi truck with a full cab of infantry.
I'd say there needs to be a test with allowing full sized cartridges to do more damage to soft vehicles and helicopters.
I believe the reason HE feels off is the way the splash is checked for damage where a small change in terrain would eat the hit. I could also be very out of date as I don't often play as armor anymore.
Damage to vehicles though, I have seen a blackhawk going so slow preparing to land and have dumped an entire belt of a PKP into it only to have a couple infantry killed off and the pilot could almost be heard laughing as he flew away. Unless helicopters are more armored than I think, 7.62x51/54 should be scary and punch through them.
HE rounds also need a obstacle-ignoring radius.
Maybe give it another explosion of around 300 IED-type.