Well, I have now collected my car back from the dealer (still with no camera in it - I might put more detail in another thread if I can face it). He had the techs look at the DCC and reported that it is showing no faults. He also told me (without prompting) about the DCC in his Sirocco and how he can't really feel any difference either - which mirrors my experiences.
However, I think I can now feel a difference. Maybe I'm imagining it - I need a longer journey to test, really, but I reckon the front has got more movement in it in comfort mode now.
Now I don't know whether I'm imagining it or whether they've found something wrong and fixed it and are trying to hide it for some reason.