The Russian T-80U is placed at a battle rating of 11.7 while the swedish version is placed at 11.3,
The reason for this is because it doesnt have the NVD upgrade and the 3BM46 (which has 532mm penetration) now, i think that it should be moved to 10.7 or 10.3 because (ill take the T-72B for an example) it has the same round with 457mm pen, doesnt have NVD, quite similar armor and is placed at a BR of 10.3. 10.7 would be the perfect br for the Swedish T-80U.
Sweden does not have any 11.0-11.7 tanks so its very difficult to have a good lineup of tanks where one of them is 11.7, so there are two options,
Move the Swedish T-80U to 10.7 or
Add more modern swedish tanks to the game (at 11.7)