I think it's 0 - 0.3 metallic value. There's also slightly visible leaky thing in albedo/roughness. Try to make your lighting softer and only accent lights - sharper (like warning lights, whatever). I suggest you to try color correction - at this moment I found your screenshots too bright and contrast.
The thing with matX is that they changed the scope. Its now part of the USD universe. They have to work together. First they made both compatible. I expect the fruits of this mid 2023.