Did they change KV-2 recently?
If they didn't then I don't think any buff is required. It used to 2 shoot Panther.
Soviet Industry may need some adjustment though. I don't use it that often so I have no idea.
Last change it got was a handful of nerfs and increasing MP cost by 50% while doing nothing to the mp penalty.
And it used to 3 shot panthers with pathetic penetration chance.