I travel about a fair bit, and the general standard of roads in the west of Scotland are IMO up there with the very worst in Western Europe that I've experienced.
The Z isn't a nice car to drive on poor roads, and it is a problem that is starting to get me considering if I want to keep the car, given I do 70% of my motoring in the West of Scotland. I don't like my traction control flashing whilst driving normally. It was a brilliant car to drive on the good tarmac, and sweeping A roads of North Wales.
If you have the chance maybe try going out in someone who has a 370 with coilovers, not overly lowered and a soft damper setting?