I'm not so sure that the wind is going to dominate like that. With the 1 liter bottles, the outfit isn't aloft for all that long. I would expect that under most weather conditions, aerodynamics of the rocket and recovery system should be as important.
How about running it like trajectory? The target distance is not revealed until the day of competition. You'd need multiple rockets or tunable aerodynamics to score well. Not much chance of a good showing with a rocket that you slapped together the night before.
Anyway, I get the message that this isn't very popular, so I'll drop it. It would be nice to hear some more ideas of changes that could be made that would be less unpopular, but would keep the event from being repetitive. Bonus if it requires some ingenuity and effort to do well, but I'd settle for new, interesting, and entertaining.
Banning parachutes was an interesting idea, but I'm sure we can come up with more.
How about allowing stored energy devices to deploy the recovery system? Timers, rubber bands, springs etc, as long as they don't power flight. The correctly packed parachute was actually in this category already, and nobody said boo.
A requirement that the egg be visible on the pad? The judge bust be able to distinguish a mark on the egg before he pulls the trigger.
Disallow adhesive tape? It would be fun to see the alternatives. Kind of like banning parachutes, though. I'm not sure I like either - it seems too specific.
I'm sure that we can come up with much better ideas.