Out of curiosity, do you have any Meta apps installed? I've tried to kinda debug the issue by reading the system logs. In the end my battery life was greatly improved just by full removal of facebook, instagram and, especially, messenger. It also helps to disable background data for all the apps you don't explicitly want to run in background and to set "restricted" battery mode for them. I'm using grapheneos with sandboxed playservices by the way.