How about adding a short vechicle stun (1sec) to every Zveroboy shell? It was a 48kg (107lbs) shell so even if it did not penetrate enemy armor, german tankers would have blood in their ears becouse of the explosion.
OSTHEER IS DONE WHEN IT'S DONE!
In practice ISU152 carried full load of HE, not AP rounds as it was actually more effective, dual purpose and bacause the tank had too few rounds in storage to effectively split them between AP/HE.In 1.2 ISU cost drops to 800 as does the Tiger/Pershing amking them all a bit more attractive