I loathe taking my car to a dealership service dept. , they really can't tell one car from another and unless a fault code shows up on their little box of tricks they tell you the car is fine. For example, when my turbo blew the "mechanic" tried to tell me the car wasn't lacking power, and the horrible whining noise was just the impellors spooling up !
To be honest though, the 1.8T's and PD150's come with vw "sport suspension" and I wouldn't really call it stiff.
If the shocks arent knackered and they won't replace anything under warranty, you may want to look into aftermarket suspension.
Chris.