@antidroid thanks for looking into that. A rather odd design decision but happy to know that also means they likely used an earspeaker that should tolerate high volumes.
@pengaro yes, icons and text (the whole UI) basically are tailored to the non-XL variant screen resolution, they will look bigger on the XL since that's the scaling value it has been set to. But you can change it with the Ubuntu Touch Tweak Tool.
Thanks for the reply. It's not powering down at all. It literally goes to the Android Recovery screen briefly before the Google splash screen then boots into UT.
For anyone else, if you do a factory reset and wipe out your personal data it will reload the os and work ok. IT would be nice to figure out what app or tweak causes the issue though.