I've done two sprint finishes on that last downhill. One head-to-head in 2010 and one with a guy on my tail in 2013. The traprock terrifies me. You clearly weren't finishing hard enough.
Compared with the greasy mud slopes, it was pretty okay. I was about 30s ahead of someone who seemed like a faster descender, but I didn't dare look over my shoulder to see if he was gaining!