Can’t really say anything in regard to the first person mod, but the game works beautifully in immersive screen mode, which should be the default.
As far as “blurry 3D” is concerned: for a crisper image run games at higher resolutions. The higher the resolution, the better the image quality. Typically 1440p starts to look quite good. Be aware that higher resolutions have an impact on performance, so key here is finding the right balance between image quality and frames per second.
Also please check the ‘Custom Resolutions’ guide either in the vorpX help or here in the forum. It explains step-by-step how to add resolutions to your PC that it can not display normally.