The whole "clouding minds" idea was stupid to begin with.
He could've been able to shield himself from easy detection, or maybe play tricks on people here and there, but that's fucking it....excuse me,but I remember well in the ROTJ novel where the say after the Emperor's death,the Imperial Fleet lost it's cohesiveness and without his extreme will focused on his forces they were routed. I would say that if he had the power to influence his fleet he would be able to cloud the jedi from knowing who he really was.