no leave ai off.......use your heavy halftracks in a classic ambush......
Good luck with this.
Nubjager, I'd say keep Allied AI Command ON at all times. Allied AI is pretty much awful, like a five-year old child playing with plastic toy-soldiers (to me it seems it doesn't have a clue on what to do with his forces on both, the tactical and operational map), so having it act on its own only makes one go bananas. That's odd, considering the enemy AI is pretty good.
I don't have Krasnaya Polana yet, but If your infantry is dug-in then perhaps try deploying it right behind a tree line (if any is available), or right at the start of some reverse slope, so tanks can't shoot them unless they go around. All this on a predicted direction of enemy advance. Keep your StuGs and 251/9 hidden on the flanks until the very last moment, when enemy detects most of your trenches and his tanks are busy spraying their guns at your infantry (CQ). Then roll the out of cover and begin hammering at their sides. With a bit of luck, you might knock some of them out, especially those T-34's as it's a completely different thing with those bloody KV juggernauts...
It reminds me of a similar battle I had during the Fall Blau campaign (although I had a lot of artillery there, to fend off infantry):http://img850.imageshack.us/img850/1092/shortaar.jpg
Oh, and while you're fending off those tanks, you can dedicate your 251/1's to capture some objectives. They're pretty fast, especially on roads so I found them very useful on "infiltration" missions behind enemy lines.
If your troops didn't have time to dig-in, or enemy tanks advance with a lot of infantry, you might try hiding in buildings (if any are nearby) or just moving your forces towards enemy objectives, but completely out of enemy forces' sight. Just totally avoid them and try to catch the enemy in the Kessel.
Depending on your situation, you might find these hints a complete BS, but I just wanted to throw some of my five cents in. Perhaps they might help and so I hope.