My personal record with The Dark Knight System against titled players has improved again somewhat:
38 games, from bullet to blitz and rapid chess to classical time: 8 * NM, 8 * CM, 14 * FM, 1 * WIM, 6 * IM, 1 * GM (Viacheslav Tilicheev).
Total 29%. For an amateur player against title holders (all games logically with Black) a good result (against such opponents I count every half point as a success).
All games can be found in a study collection on Lichess. The most recent success is a blitz game (3 min + 2 sec) in the Lichess Mega Team Match against the Argentinian IM Needleman: