Hiroshima for two nights in middle of Tokyo trip?

I’m making a trip to Tokyo around Thanksgiving time. We are planning for 8 nights in total. Will arrive Tokyo late, have our second night there, then the plan is Shinkansen to Hiroshima for one day/night, then Miyajima for one night, then the following morning back to Tokyo for four nights.

Is this too cramped? We’ve never been to Hiroshima and have heard wonderful things. We’ve traveled in Japan before many times, enjoy the Shinkansen etc. I just don’t want to make things way too rushed.

Thanks and any tips to make this work are appreciated!