Topic: New Client - Windows Scaling issues
This is partially for anyone else that has this issue.
I'm using my laptop for this, which I use DPI scaling via windows10, set to 125%. The scaling applies in-game as well, which makes matching resolution fullscreen a problem, as it scales the game outside the bounds of your screen.
If you go to the properties of the game.exe, just go to compatibility and check Override DPI Scaling. By default it'll be set to Application for controlling the scaling, leave it on application.
Problem solved.