How do i switch rings from omega to (most likely) delta?

In my understanding the Dashboard experiment, A, B, C selection, is totally random.

As "Both consoles say their OS Version is (19h1_release_xbox_dev_1911.191028-1335)" your consoles are either in the Beta or Delta ring.

Both those rings and Omega ring are getting a preview update News release notes Beta Delta Omega
Insiders today, which you can manually start or wait until it becomes mandatory.

After you do the update, if you want to change rings, it will be the perfect time to change as all those rings will be on the same release. Subject to eligibility.

As an Insiders You gotta make a report for all the bugs You see, You must be in Alpha Ring, this ring is the most unstable, but not more than Alpha Skip Ahead, when You decided to join the Insider Program You knew there were a lot of bugs in the preview
OS, You can change another Ring, Beta, Delta or Omega, but the most stable of them is the Omega ring, now it's You who decid which ring You Will choose to recieve updates or If You Will choose to recieve updates like a normal user.

In which ring you are? Omega, delta? The right place for question is on insider reddit page.

Hi, it depends what ring you are in. Currently there is no insider build for Beta, Delta and Omega rings, this means you will be on the current public build.

One thing to be aware of, you must be active in the insider program for a while, and be selected for the alpha ring. You will likely start in the "Omega" ring, and after 1 month you can move up to the "Delta" ring. 3 months will get you
into the "Beta" ring, etc.