Can’t speak to your first question or to ENB, but you might be able to use Raedon Pro to inject Sweetfx, even with an Nvidia card. This works with vorpx activated. I’ve tested with Dishonored, Thief (2014), & Bioshock Infinite. Unfortunately, I’m unable to provide instructions. Someone on the oculus forums posted a youtube tutorial. You may want to search there. In addition, you may have luck with google searching for Radeon Pro/Sweetfx/Nvidia (in the event you have an nvidia card).