They never bothered to give the Ta-152C it's historical wing, so is modeled with the smaller FW-190A wing, robing it of 1.3 square meters wing area.
This means the aircraft will be faster at low altitude, slower at higher altitude and worse in turn and climb.
This explains why the Ta-152C is flying the way it is in game. That's why is such a dog up high and every time you pull on that stick.
Remember the "too much speed" at low altitude when it came out? I don't think they bothered finding the reasom behind it.