The problem was GeForce Experience & Nvidia driver issues with the latest W11 update. An update was pushed out today > PSA for anyone else experiencing micro-stutters on W11/Nvidia systems. I was having the same issue. Also, if anyone uses DSR/DLDSR, turn it off and turn it back on.
Don't see anything about it being fixed nor have I seen an update from windows today 9/27/2022. Read the notes for the new Nvidia drivers and they have added support for it 22H2 but no mention for the fix for low CPU usage. Issue has not been fixed. Issues still persist! Have low CPU usage on my system with 3080 Ti!!!