You are only getting 4 hours of SOT?I think I said in my post but basically it went from 7 hours SoT to 4. Big hit!
That is honestly terrible! Something must be off. Maybe a rogue app or system process??
I have not really done an official test. So far I have run the phone with adaptive battery and without it. So far I am getting better results with adaptive battery off but I know it takes a week at least for the adaptive battery algorithm to do it's thing. Even still running the phone at least 8 hours of SOT and probably longer with 40% left at the end of the night.
So I don't see how you would only get 4 hours of SOT unless as I said rogue app/process or there is a hardware defect.
I would reset the phone as new and see what happens. If that doesn't resolve the battery life problems then I would contact Google or whomever you purchased from.