I’m using all of them sometimes. ^^ Washed out colors are not an issue on AMD anymore as you said it, but on nvidia I can’t seem to fix it. I wonder if this is happening to absolutely everyone, as the arch wiki makes it sound like nvidia 545+ has been reported working…
About the contrast: I wish I could, but I found that the factory default was 70% and it did seem to often cause noticeable dimming because the image was too bright for the max avg luminance. It felt weird and I think it’s because Alienware, like many manufacturers, just can’t resist blasting the consumer with overtuned contrasts to get a purchase out of it.