I haven`t driven a Xantia for a year, and that was my old R plate estate. It been at least ten years since I have driven one this old so hard to say what it should be like!
I`ll change the fronts anyway and see what happens
Depending on what sort of ride you want depens on what spheres you fit - VSX/Activa spheres give a firmer ride than say estate spheres fitted to a saloon - personally I always went for comfort and used estate spheres on my saloon.
Dont negelct the accumilator sphere either - check for the duration between clicks. 5 seconds and its time for the bin.