Thanks for the tip.
I checked and it is currently off with me and when turning it on, it did make the everything darker and when turning it back up in brightness, it does seem to be closer together between them. However with it on, it all looks quite dull / washed out and not that good, not sure if that is the reason it is closer together rather than trying to resolve the difference in brightness. Any other thoughts?
I originally had gsync off, set colour to srgb, enable vsync, in the menu and nvidia control panel. Black equalizer 13, brightness what ever you think best, local dimming on, vrr on but don't think this really matters. Device install from here https://www.samsung.com/uk/support/model/LC32G75TQSUXEN/ this allows the colour profile in the monitor settings. And HDR off, in game seems ok but windows is trash with hdr. My room is fairly dark so have brightness at 50-60%