Yeah, Chaos Control is a big no no in that stage. Using it activates the switches which is why I had to go Dark when I first played the stage. Just play though the stage, never activating any switches, if even one is active, you'll fail and have to backtrack and deactivate it. Just don't use Chaos Control unless you are sure there is no switch in the way or you can easily press X (cuz when you first start CC, pressing X does nothing for a few seconds). To A Rank it, kill as many enemies as possible.