Rise the height of the car a bit more like 10 mm's and soften you shocks. A spring rate of 5,5 kgf front and 6,5 kgf rear and a bound at 3, rebound at 7 (uniform for fore and aft) could help. Also the stabs setting should be lowered to somethig like 5. However INHO, the Xsara sux....