also, maybe have a 152mm howitzer to pay tribute to gloriously stronk Kv2? I feel it should pay tribute to the comical amount of explosives and lack of armor penetration capabilites. therefore, i suggest a cannon that can set fire to parts behind 1, even 2, layers of armor to simulate shrapnel and spalling. If the cannon shoots at unarmored parts, the explosion will be massive but will not penetrate anything past the initial impact point, representing the 0.1mm fuse sensitivity of the ammo. When shields are hit by this cannon, a large chunk of energy is drained as a result of stopping so much kinetic energy from the explosion
(I've played so much War Thunder Kv2, that i actually remembered all those characteristics)