Rob, remember that the couch, like any other mobilization, doesn’t exist just for its own sake, but can also serve as a valuable diagnostic tool. On days when the couch seems sketchy to me I take this as a cue that my quads and the front of the hip are too tacked down. After 5 mins plus of smashing with the Supernova or Battlestar I re-test the couch and the sketchiness goes away/my ROM is better.