The Zone 8 Competition Rules says "O. In case of a tie the other timed run(s) will determine the winner. In case of a tie on the other timed run(s) dual points and trophies will be awarded."
Note that the Parade AX PCRs specifically state that ties stand (A-8.2.4) - any tied competitors are to be given equal awards.
Personally, I think the Parade approach makes more sense. Your best run should determine your standings - if it is a tie, then both should be awarded the same points/trophies.
Consider a driver who has a good run, and then has a mechanical breakdown (or tire problem, etc.). If another competitor ties the first driver, and then has ANY additional run, does the second driver deserve the win more than the first driver?
Anyone else think we should propose a change to the Zone 8 Competition Rules to the effect that "a tie is a tie is a tie"?
