i rode the route about a month ago just so it was fresh i nmy memory for the day, and one of the things i decided then was that i was gonna let a ton of air out of my tires for the decent. i rode up at 130psi, and when i got to the top i let out a good blast of air, got down to about 80psi, by feel.
MUCH softer descent than usual. so i guess thats my contribution. if you find the summit to echo lake portion of the descent to be a little too prostate rattling, try low pressure.
or full suspension.