Loren,
I'm glad that you have some experience with Rallys.
I do too.

The best person to check out a route is not the person who wrote it, but someone who is attempting to make it work without having prior knowledge of how it's "supposed to work".

Generally, routes should be laid out so the average beginner will do well and return for another enjoyable experience. There are tie-breakers that will separate the experienced entrants.

If you need someone to pre-drive the route, using the actual instructions, I'm volunteering.-Bob

I'm not saying that your event will be, but.....
I have been on enough rallys that were mapped with unrealistic average speeds that required entrants to break the law in order to get even close to the average speed. Everyone knows that the posted speed cannot be maintained as an average speed.....for a lot of reasons. I don't know that I need to list
them here. When people feel forced to drive over their head to avoid time penalties, they don't come back.

I have been on enough rallys that were put on by rally masters who thought it would be fun to toss in non-standard and vague instructions with the goal to screw up the entrants so they could show how smart the RM was and how dumb the entrants were, as a possible ego thing. Novices driven away by this tactic will
not be back again.

I do wish you success and hope that you accept my sincere offer to help.-Bob