For games that launch with an Oculus option from whatever platform, use Oculus tray tool.
For Steam games that use Steam VR, render resolution in Steam VR settings.
You should be able to get away with anything from 1.6-2.0 (160-200%) with your setup in most games.
I'll give it a good. Not sure it worth my upgrading. I might buy one and it ends up under the bed again