IIRC it was changed to 240(?) damage and slower reload once, and it was apparently horrible to play with.
(Nitpicking: the IS-2 uses a 122mm gun. Soviets are weird)
240 dmg pretty average dmg output for is-2 to be effective heavy breakthru tank .
320&360 dmg would be ideal with longer reload time would fit more but the main problem of the tanks in this game is the game mechanics. Tanks are stoppable by T0 units in this game. . also infantry is verry effective vs tanks , heavy tanks fuel requirements are too high that tanks arrive to battllefield little late and dont have enough time to vet,
no matter how much relic does buff & nerf , is-2 and other heavy tanks wont be effective as what community expects/hopes. Game mechanis needs a redesign