If your Corbin is anything like mine (3 years & counting) it never breaks in. I could kick myself for thinking it would be more comfortable than the stock seat!
I've used "light impact therapy" with a ball peen hammer so soften Corbins in the past.
My Smuggler has BeadRiders and the firmness has been dissipated over the last 90,000 miles.
Good luck,
Steve
My girls: Isleen - 2014 F6BD Saorla - 1995 FLSTN Heritage Special
"Politeness, n: The most acceptable hypocrisy." Ambrose Bierce