That sound from the Citromatic used to be called 'boinking' and it is inescapable unless the fluids and seals are up to snuff. Citroën hydraulics are detailed but not that complex, patience + Viton aftermarket seals (green fluid = hexylene glycol) are your friends.
Agreed that the ID (idée)-19 had a lot of advantages from its simplicity.
> Citroën hydraulics are detailed but not that complex
Have a look behind the left hand front wheel cover panel and say that again :) There has to be at least 50 meters worth of high pressure line behind there and a functional analog computer using hydraulics. That's what keeps the car balanced front/back and left/right. The height adjusters just do the static balancing for load, that thing on the left front does it dynamically with a response time in the 10's of milliseconds and keeps continuous track of what 'level' means to the car occupants. It is a very impressive piece of engineering which has some components that will leave you completely puzzled (a tube with a few hundred metal plates in it with a tiny hole through the middle, for instance) if you don't know what they are for.
Agreed that the ID (idée)-19 had a lot of advantages from its simplicity.