It's not part of your itinerary but if you wanted to head further west after Hiroshima, I'm exploring Kyushu a couple of days before hopping to Okinawa. Will base myself out of Fukuoka which is ~1 hour away from Hiroshima.
Nov 24: Fukuoka - where the Fugu comes from, but it's only in season during the winter. Nice city with other good seafood and known for Tonkotsu ramen
Nov 25: Kumamoto (traditional Japan. Very good food and much more traditional culture) + Dazaifu
7 years ago