I believe Romney has little connection to Utah other than being a Mormon. I don’t think he has ever lived there. He might own some property there.
You are correct. When he decided to run for the Senate, he bought a home in Deer Valley. At that time, his principal place if residence was LaJolla, CA. He also had houses in NH and maybe Michigan and another state. People associate Romney with Utah because he is Mormon, and because he worked on the Salt Lake City Olympics, BTW, he is considered the most hated man in Utah now.