Welcome. Nitron, Ohlins and Hagon all do rear shocks. Ohlins also do a front kit, or I think you can swap out the oil for something a little heavier if you want more damping. Parts commonality with the MT07 works in our favour!
IMO the XSR's weak point is its suspension, particularly the rear which gets very bouncy over more challenging roads.
IMO the XSR's weak point is its suspension, particularly the rear which gets very bouncy over more challenging roads.