HDR too bright at night

Hi i have a very irritating issue with my xbox one S in HDR mode.

I play on a samsung Q70r with all energysavers turned off.

So here‘s what happens.

When i play at daytime my contrast is as it should be,

but at night i have a „white fog“ over my screen it seems to me after 2 weeks of testing that there is something wrong with hdr settings coming from my xbox one s.

First i thought it is my tv, but after checking all possible options (Dimmer, Energysaver etc.) i can surly say, no.

So i came to test HDR settings in Forza Horizon 4 (btw Jurassic World Evolution does the same at night)

After all testing it has do to something with the whitepoint.

These are my settings at daytime (kontrast is A+), turned down the contrast on my iphone to better show what i mean. At around 1000 my whitepoint seems to be ok. The forza logo is nearly faded out...





At Night with the same tv settings and nothing else changed, i have to set the whitepoint to 9300 tonlet the logo nearly disappear





When start my xbox at daytime and play until its night, everything is fine. But when i start my xbox at night some voodoo happens )

Any solutions?

:)