They just need 250 kg FAB / 500 kg FAB bombs on br 3-5. Germans and USA have a huge amount of strong air force on br 3-5, the latter can fight even without the analog of fg 42 2 and king tiger only thanks to their planes (well and the fact that in Normandy they capture strategic points faster).
The ussr just doesn’t have 4br planes, and 5br is represented by 1 il10 plane, la7 is rather close to fiat g55 on br4 in all characteristics. (even in war tander they have about the same br).
Here’s an example of planes that should definitely have been added.
La-7B-20