Time detonation for shells, a larger radius of destruction in the air by fragmentation and high-explosive shells, because anti-aircraft guns are meaningless now
To calculate the damage of high-explosive shells, I can suggest using "energy". In all directions, the projectile has, say, 100 energy. For 1 meter in the air, he spends 10 energy, for a meter of blocks - 50
For a fragmentation projectile, raise the number of fragments