Can you turn off IPv6 at your host? That's the first thing I did when I discovered this issue. Even with Cloudflare IPv6 turned off, my site sends itself many requests.
Oh, the IP address you posted *is* a Dreamhost server. From Manage Domains, I did the "Add IP" option, then got an IPv6 address. I think my IPv6 address started showing up on my Manage Domains page. I've since deleted the entries, so I don't remember how I did it.