mapping gurus on the site along with my own personal experiences in the 08-10 realm typically feel that a 2009 XB with a hawk muffler and OEM air filter will have rideability issues. having owned 4 XB's to date in this model year range of which 3 had hawk mufflers....i found that replacing the OEM filter with a K&N along with NGK DCPR9EIX plugs....a tps reset....and "ride in learn mode" resolved most of what you described as issues.