Sean's (& Ed's & Scott's) Astor GTi6

[Poodle]

You're on solid mounts at the rear, yeah? In my mind that only leaves the options of something loose or knackered shocks, would guess the former from the odd geometry changes you've mentioned. Is it possible that the solid mounts mean more vibrations going through the shell, therefore more parts working their way loose...? Don't know, probably chatting crap, will be watching with interest fella.