Disagree on that count. 7 man cons are incredibly potent infantry when parked behind green cover. I'd also point out that Soviet infantry also includes Guards and Shocks that can easily compete with their respective counterparts.
The IS-2 comparison isn't quite accurate because the Elefant has direct counters, and only shuts down frontal armored assaults. By contrast, the IS-2 will deal with everything that's on the battlefield, and it's only reliable counter is a Tiger.
How are you struggling vs cons when they are plenty of units like Obers, Falls, PGs, LMG/G43 Grens, and plus combined arms play?