Whenever I update the oculus software it forces me to play at 72hz. If I want to go back to 90hz I have to uninstall and reinstall the app and snooze the update. I went in multiple times to set it to 80hz and 90hz but it locks it at 72hz. I CAN NOT STAND THIS ANYMORE!!!!!
I've solved this issue by rolling back to v25 (you can download v25 from this post on reddit) : https://www.reddit.com/r/oculus/comments/llo2gk/google_drive_folder_of_various_oculus_pc_client/
and you have to follow the instructions posted on the top comment to prevent the app from updating to v27 again