Sorry for the long original post, I was trying to get all the details out there for troubleshooting.
I spent a little more time digging into this today, using LiveMap to test routes from various points.
I've narrowed down one area that I'm completely at a loss for why it acts like it does.
Here is the permalink for the area in question:https://www.waze.com/editor/?zoom=3&lat ... TTTTTTTTFT
When I start routes from that area, I'm getting widely varied routes.
From this point north of CR-417. 3h34m - 226miles or 3h51m - 237.5miles
From this point south of CR-417. 5h3m - 311miles or 5h30m - 336miles
The points are only 0.5 miles apart and it will find a route directly between them.
I don't see any odd turn restrictions or other problems on that node between CR-417 and US-77. So what would cause a 0.5 mile difference in starting point result in this extreme of a route difference?