When the front dampers were replaced on my car it made a step change improvement. I still get back kickback on severe bumps but it is now a rare occurence rather than something that I'm fighting all of the time. I now dont notice it for 99% of the time whereas before I couldnt fail but notice it all of the time, to the point where the car was almost undrivable. There is definitely variability - I drove the demo car at Allon White and it was in a different league to my car.
I'd strongly recommend doing a back to back with another car and try having the dampers swapped. Interestingly when the "problem dampers" were taken off my car and fitted to the demo car it still remained acceptable which suggest a vehicle and a damper variability issue...
