I always get the developing saddle sore (skin abrasion) on the right side after a long ride Brevet 200k or more. On repeated daily 200k brevets this abrasion develops into a sore.
I use Chamois cream on these long rides too.
When I shimmed the right cleat using LeMond wedges the skin abrasion developed less.
I also turned my saddles nose slightly to the right relieving some friction on the right sit bone that I also think helpedtoo