My settings look the same, and as mentioned I’m on a 3090 (desktop). Never used “advanced GPU lighting” either, because honestly it looks so bad I think it’s broken. Have you tried enabling it on the default “shaded” view mode, for example? That can’t be right. 
Btw, this is my most used viewport display mode:
It’s basically just isolines and tangent edges hidden (and the “ambient occlusion” lighting method)… I’m very surprised this isn’t a built-in mode because it is in basically every other CAD package out there.
Design.ini (13.9 KB)
EDIT: Ok… got a bit inspired and actually created something I wanted myself for a long time… now, if only I could export these lines and shadow outlines as SVG… 
Technicolor.ini (12.9 KB)