I would also mention that the way grenades inflict damage to player made structures can be very different in actual gameplay, since a smallest bit of concrete or 1 step on the stairs or a small rock sometimes seems to soak all of the damage from grenade. Overall grenades need to be a lot more reliable imo.
Personal opinnion from a guy with 5000+ hours in game (me) and spends most of his nights either building or raiding a base: Raiding with melee weapons should be nerfed very significantly. As of right now, it is very possible to take 2 of your friends and grab every melee weapon from cherno and use them to raid a base with 3 gates (or more, being conservative here) protecting their loot. Yes, this is very tedious work to beat down a wall with 3 gates with just melee weapons, but trust me, people are more than willing to do that. Baseraiding should carry a significant risk and that is definitely present when using nades/weapons because of the sound you make attracting people your way. So here is my suggestion. Once the health on player made structures is increased due to the weapons now dealing more damage. Don't increase the damage melee weapons do to the player made structures.