Hi
It's been a while since I used CC, since it's limited to CD quality, but after reading your post I wanted to check my settings in Google Home.
I followed the path you indicated Google Home App => Devices => Select WiiM name => Click cog wheel => Audio => set Full dynamic range "on".
Well, I don't see the gear wheel. GH sees my two devices, WiiM Pro and Ultra, but when I click on one of them, the gear doesn't appear on the top right, but three dots. If I click the three dots, a useless menu opens. Send feedback, cancel and another similar option that doesn't do anything.
Any ideas? I think this happened after the latest GH updates. I remember before I could adjust the settings that affected the sound quality.
Am I doing something wrong? Is there another way to access the playback quality settings?