Problem solved
So I took the car to one Subaru specialist. It was really something. This guy knew all the smallest details about Subarus. First thing was to check EGR valve. Subaru service diagnostics didn`t show any fault codes related to EGR. But we made a test to close the valve permanently and bingo! There is was. After that car was running very smooth. The rest of the day we spent optimizing injection settings and values. Result, 25% more power 3700 rpm, 20% more torque 2200 rpm. And the most noticeable thing is how smooth it is running now. Fuel economy also got a lot better, 0,42 gal/100 miles less than before.
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