You mix HDR specific settings with SDR specific settings. SDR on HDR looks washed out.
Decide if you want to record HDR or SDR and use a complete configuration set for this.
To reset to default good working SDR settings, create a new profile and run Tools->Auto configuration wizard.
If you want to record in HDR, your Windows system has to be set to HDR, your game needs to support HDR and set to run in HDR. In OBS, start with the settings mentioned in the release notes of OBS 28, but be aware: it's not yet established and widely known what the best set of configuration options is for HDR. The HDR support in OBS is very new.