I agree, I think a reload buff would do alot to make the unit scale better into the late game when other heavy units already start with much better ROF and the Kv2's slow projectile has a slightly increased propensity to miss.
Easly replace the 30% turret rotation with a reload buff at vet 3 (hold the title of being the last tank in the game wit hjout a reload buff with vet). But yeah it's just that, at vet 3 the kv2 is just really disappointing as it dosnt really feel like it hasn't really improved since getting it.
I mean whould you prefer to fight a vet 3 is2, isu or kv2?