I'm not as familiar with rules other than Canada and FAI but, most I've seen provide a complexity factor (k factor) for maneuvers. The issue I have with this is that it benefits the more modern aerobatic type aircraft.

Judging is a difficult task (I know from experience). It's hard to not let your own emotions get involved. For example, I will always score a sloppy egg shaped loop performed by a Jenny higher than a geometrically perfect one performed by a Cap 21.....

As with all competitions, there are good and bad judges. You do need to explain how and why you will perform your maneuvers (and then perform them that way). The rest is literally up to the judges. The one thing I always appreciate from the judges (and ask for in advance) is a written critique I can take away and work on fixing/perfecting. I may disagree but, repeated low scores for a particular maneuver (or detailing) should sway my opinion.[8D]