Only 5 registered, 2 started and 1 finished in 2023. If I recall, last year was the first time for the event. Based on that, you are not going to get much feedback for that specific event. There are a couple of forum members that live in the area that might pop in and give you something IF they happen to see your post.
I have ridden the 508 as a four man relay twice and both times rode up 6 Mile Canyon and down Geiger grade. 'Twas a tough climb for a Clyde but a fun, fast trip down.
I graduated McQueen High School and UNR in Reno and miss the area. I think the high desert is beautiful and this would be a great course.