Yeah your probably right there, i dove around a mini roundabout that has a small hump on it and noticed that the rear seemed to almost hop slighlty as i transitioned left to right over the hump.I would go with the softer setting Alex when using the OE front end setup.
With decent dampers and springs fitted with that new ARB it will be like a go kart.
Once the wallet has recovered im definitely going down the B8 route!