I agree there should be some type of seeding, however I wouldn't want the nightmare of trying to do it for this event!!
My question and maybe part of the solution is why not dump the High School and add the 6 year old to the Championship series? The High school class makes up less than 10% of the membership and oh yeah they have their own tournament that is regarded much higher than winning a state title in "Kids".
Of course this would create a nightmare for bracketing at Subs but I believe it could be done with some of the smart people we have out there already running large tournaments.
Just curious.