I think there are one or more injectors which don't work correctly.
You said you have checked your injectors.
You can do that in different ways: You can easily check the idle with a BMW Group Tester (DIS or GT-1) and you can check the "Leckölmenge", that means you can check how much Diesel is running back from the injectors into the fuel tank. If there is one injector with much more Diesel running back into the fuel tank than the other ones, then you can say that this injector doesn`t work correctly.
But I don't know if there is the necessary equipment for that in Greece.
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