Slyk, I haven't been playing as much lately, but whenever I'm on I never see this map any more. It's just not being played as much so I haven't had a chance to test Beta 4 yet.
I also wanted to add a comment concerning the balance of teams. In the main discussion forums, someone pointed out that the defending team should often have less players than the attacking team for balance purposes. Not just less reinforcements, but less players actually playing on that side. I tend to agree, since defending is typically easier than attacking (not saying so on this map, just in general).
One method for enforcing this would be to limit the number of ALL classes available on the defending side. So, when the server population is low, there would be no change. But on full servers, if the defending side were limited to (for example) 1 commander, 2 tankers, 3 automatics, 2 Anti-tank soldiers, 2 engineers, and 4 riflemen, then the most players they could EVER field would be 14, leaving 18 for the attacking side.
This would give the attackers an advantage in firepower and overcome the disadvantage of having to take well defended emplacements.
Maps like Rackowice would DEFINATELY benefit from this. Perhaps this is something you might impliment on Berezina or future maps.