yep! been there...
very challenging indeed.
we start out doing simple things, basic technique or turnpattern, then let the music play and go to the more advanced students.
Sometimes, if it's just the one couple in the group, we give them some extra variations or personal tips on technique or styling.
but it remains difficult, coz the 'lower'levels are often very eager and want to try out the more advanced stuff too. That's why we try to be not too obvious about it.