Theres nothing to fix. If you prefer to sit at edge of map pretending to be simo häyhä its entirely up to you and no one stops you.
No, if you prefer to play simo hayha, then you may to do it. I prefer moving and I don’t see where to do it in rat labyrinth, so i call ratter
A panther gun doesnt shoot from under the target tank or into the engine deck
The shockwave could have a smaller lethal radius than the frag perhaps (although i guess a shockwave would turn your intestines to smoothie irl) and give it a knockdown/stagger radius outside. I am not sure what the lower limit for armour thickness on a vehicle would protect against a dynamite of that size in reality, but making it more critical to a vehicles modules and then maybe light damage/concussion to the crew could improve the vehicle - infantry balance given that a lower level higher risk AT grenade is introduced (I.E., magnetic bombs or a more lethal planting mechanic for the HE grenade.)
Think they are adding a new AT grenade when looking at some hints to next updates. Will prob rework the whole AT grenadin to an more lesser impact for reg infantry perhaps. Just speculating
no