[2022] Is BR +/-1 variance actually the limit

It's should not be possible. Please provide any evidence (server replay as mentioned above should be enough).

As showed above, you are wrong with checking BR.

I guess you are using Arcade battle rating in your tech tree.

Go to hangar.


Open any tech tree.


Bottom right corner of it - select AUTO.

Now game will show you BRs for mode you have selected in [TO BATTLE].