I’m have a fairly good computer and it run fine it VR medium-high settings. With PMDG 738, the cockpit resolution from my point of view is never totally clear. The portion in green (on the picture) is not perfect but it is clear enough. The portion in red is always blurry, even if I crank up the rendering resolution a lot.
You say you have cranked up the render resolution but 2080x2244 is not very high at all, especially if you are using DLSS. If your video card can handle it, try a render resolution closer to 3000x3000.
AFAIK, all VR headset lenses introduce distortion that is overcome by super-sampling, which means rendering at a resolution that exceeds the actual pixel count of the display behind the lens.