Please no extra grades, where do you draw the line? Sooner or later there would be a class for just turning up, rather meaningless.
Better to shoot and come no where in top grade rather than win in a lower grade.
Dubiously whats now AA maybe better shots than years ago? Remember this grade was recently created.
Scrap mini kill and discipline distances plus max range increase to 60 yards, that would sort at least 25% in all grades.
Other way round it is put decent courses out with less gimmees.