If your opponent have 2 IS-2 and T34, then you had very low map control and were pushed off the map most of the game...
Sadly not.
Get a FlakHT / Puma, and tech to KT, and you will have nearly spent the equivalent of 2x IS2, T34, and T3 in fuel cost.
Though i'm not a huge fan of comparing this directly, OKW gains a lot of goodies and tech as well, or could also go for doctrinal solutions like 43s.
IMO the IS2 could get a slight (!) armor nerf, and KT a slight (!) pen buff.