Judging the judges:
In university courses, professors are subjected to anonymous "student evaluations", the results of which are available for other students to review in evaluating whether they want to take a class with that professor.  
I grant you, those "results" are/were often of very, very limited value.  Often students will just fill in all 0s or all 5s and give no comments as to why they scored a professor as they did.  But sometimes a few comments could be really valuable and insightful. 
Perhaps something similar could be implemented for judges at dance competitions.  Competitors could "rank" the quality of the judges at a competition.  I grant you, impracticalities abound: not all competitors/spectators know who the judges are; not every dancer knows how to read scrutineers sheets to see how they were marked, etc., etc.  
But if a particular judge got comments consistently across several competitiosn that s/he (for instance) didn't mark down a couple performing lifts that are prohibited, or (for instance) that a particular judge rarely gives recall out of a quarter-final or semi-final to a couple that consistently places in the upper half of finals . . . well, . . . at least competitors would have those comments/obersvations available to them and could weigh their value themselves.  And maybe, just maybe, a judge on the receiving end of comments like that might take notice of the kind of judging reputation s/he is garnering.
Just a roaming thought.  Shoot it down, if you like.