Vibrating on tours between 1000-2000 u/min….

Hello and Greetings I have been driving a Volvo V50 T5 AWD 2.5T petrol engine for half a year. KM Stand 220’000. Since I purchased the vehicle, fine vibrations that can be read in the seat and in the touring display are plowing me. Previous activities: gear scrubbing, Haldex scrubbing, LMM cleaned, camshaft adjustment valves tested, SW update in motor and automatic machine as well as Haldex. You can feel the vibration in the seat and a slight lowering of the tours are noticeable. But it remains the same. This at constant speed and with almost rolling operation. Then when giving gas (load) it switches down and you can’t feel anything more than 2000 rpm. If it falls under this mark while rolling and I give only fine gas it immediately reappears. Remarks: same behavior Cold or warm, since the transmission felt it seems to have become a little stronger (previously old thicker oil?) I ended up with my Latin and even the Volvo representative stands before a riddle. My fears are the shift slider .. 😉 Can someone give me any tips Thanks and friendly greetings Christian