Looks good to me. I'll leave it to the XF gurus to help you figure it out.
As I said, I since you have opcache installed already, maybe just looking for online instructions to optimize it will deliver a decent performance boost. There's also nginx proxy and caching, available on cPanel and Plesk installs. Indeed, the latest versions of Plesk have a Performance Booster feature which lets the control panel figure out the best settings for you, so you don't have to worry about it.