How to change resolution for builds under OpenXR

Unity 6000.041f
OpenXR 1.14.0

Hi there, I'm currently working on a Unity VR project (Android, Vulkan, IL2CPP). I've noticed that my standalone builds have a resolution of 1344 x 1408. This makes fonts hard to read. I tried to increase the resolution with things like: 

void Start()
    {
        XRSettings.eyeTextureResolutionScale = 1.25f;
    }

But that does not work, even when I wait until XRSettings has loaded everything.

I can't find any settings for this in Unity, either. Is there someone who has faced a similar problem or knows the answer to this?