I don't have personal experience with Pimax but I've been told it has image blearing at the sides due to software tricks it uses to increase its fov? Or maybe you're just having issues with the lens sweetspot.
The only other hmd that gives a damn about fov is Index sadly and even it isn't...
Regarding onspawnatom.cs, seems that it spawns in collision triggers with their collision disabled but there's no checkbox to re-enable them like other atoms so they're useless
I love my Index. If you can comfortably afford one and you're going to use it often, its a great choice. It has a lot of features that don't get enough attention because people are too busy comparing raw pixel density like its the only thing that matters. But when you're spending hours in VAM...
A secondhand Vive or Odyssey+ are probably your best bet outside of Quest2. The midrange VR bracket has been weird: MS didn't bother supporting WMR apparently, HTC is incompetent as usual and now Facebook is scaring everyone away with their loss leader antics.
the thickness or surface offset sliders help
if the jacket is simmed, the collision sliders and even the distance slider can help
this will make her look fat however and still won't hold up to extreme movement