Castlevania Lords of Shadow Mirror of Fate HD (282530) Fullscreen scaling is off

Using proton 3.7.4 beta

there is a minor fixable issue:

• there is a black picture on the main menu, and graphical glitches.
  It can be completely fixed by running the game with: PROTON_NO_D3D11=1 %command%

there is a bigger issue:

• If you run the game at (fullscreen) and a lower resolution than your native screen the game will not scale properly.
  *It will have an odd white border arround the game.

I fixed it by somehow navigating the menus to options and set it to run in windowed mode. Than It scales properly

1080p Fullscreen

720p Fullscreen

720p Windowed

(this fixes the resolution scaling)

The Gameplay itself is working nicely. Even Whitelist worthy. Im just confliced with the fullscreen mode scaling.

My Steam Info: https://gist.github.com/Zero86Sk/d629f657c1ae861c36657cdf238a7765

Start by reproducing Castlevania: Lords of Shadow Mirror of Fate HD (282530) with Proton 3.7.4 beta at a lower fullscreen resolution, then compare it with windowed mode and the reported PROTON_NO_D3D11=1 launch option. Done means the game scales correctly in fullscreen without the white border or graphical glitches.