@bojcistv,
I see you are moving from ford forum to get more specialist view on your vibrations problems
If I were you..I would try last thing and keeping my driving style driving up to 100km/h for next 2-3 years and then get rid of the car !
Replace all....again ...replace all, rear drive bushings on your mondeo....as I saw, you never changed anything on rear part.
It's 10 years old car...and your car (mine too) will never be like new.
I read somewhere that vibrations on the seats...99% chances are from the rear end.
One thing that you already did and you can not go back in past..for replacement you used almost all used parts and parts with questionably quality brands (Acron, Febi...). This is what you have to take for consideration also and there is no going back.
Maybe your vibration issues were gone until those "new" parts reached the same age or mileage as your original parts, or cause they are not "original" thus they last less than OEM parts.
Keep the tires inflated up 2.2 bars....I switched to that strategy also !
