Well that was easily settled. My suggestion would be to try and do as we did last year, which was leave Eureka as a reasonable sized group, and then split in flint, would be easier navigating the dual carriageway in a larger group. It's not a bad road, but I can easily see why some would be uncomfortable.
Edit: plus the hilly/flat groups can run together then.
Edit: plus the hilly/flat groups can run together then.