After iOS 17 was completed with update & restart. I then updated all my apps. and restarted again after swiping all of them up to close.Interesting but I doubt its iOS causing your issues. I have a launch day XR with orig battery and no such issues as you. Perhaps kill all apps and reboot and see if it settles down. If its choppy then something is running in the background (mail, iClould sync, etc).
I believe it is iOS 17 causing these issues with me. Was getting close to 8 hours SOT with iOS 16 using almost all the same apps as with my dismal 17 results.