Salute
For a period of time, the 190A3 and A4 were derated to 1.32 ata boost pressure from the normal maximum of 1.42, because the BMW 801D was having problems with overheating and damage to the engine. After the problem was resolved, the allowable boost was increased back to 1.42.
The Soviets and British both captured models which were derated.
There was some suggestion the Oleg had modelled the derated version of the A4, but the performance tests of the IL-2 aircraft I have seen suggest otherwise. However, you certainly are encouraged to do your own set of tests, remembering to use the Kuban map, which Oleg uses for all tests.
Whatever the results of your tests, it will not matter, since Oleg will not be making any changes to IL-2, since he has moved on to BoB.
In any case, by using manual prop pitch in IL-2 a 190 pilot, (all models) can get BETTER than historical performance out of the aircraft, (something which wasn't the case in real life, the Kommandogerat system was more efficient than operating manually) so you can see that there is no conspiracy against the 190's.
In fact there are quite a few more Allied aircraft which are modelled on lower performance versions than German. The Tempest is just one example, being modelled at +9 boost in IL-2, only 5% of the Tempests made used that boost setting, most operated at +11 boost, and some at +13.
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