Hmm....
Well, I think it hurts that you can't see the town from the railroad depot, so you can end up thinking that the map is just a little area of railroad and a couple of hills. A lot of people don't even know the kolkhoz extends out to the left--they just seem to run to what they can see, which isn't a lot. They also don't seem to explore the left and right extremes of the map at all--you can get into areas where you are alone in a white featureless fog pretty quickly, and I think people naturally gravitate to where the action is, just because they start to feel alone and scared out in the spooky wilderness.
And when you factor in how hard the battles are for the first two objectives, maybe the russians A) are a bit spent, and lose energy in attacking, or B) feel so trapped by the german infantry and tanks right outside the spawn and near the objectives that they don't feel like they have much momentum to capitalize on, or hope for future success. The town seems kind of academic when you win/lose/win/lose/win/lose the hill, and you only have 5 minutes left in the map.
I say release a version with the fog distance way out there (or no fog), and see if it plays differently. The PTRDs would start to be useful, and the Russian attackers could have an opportunity to judge where the defense's strengths are visually, rather than finding out via mystery shot from somewhere.
