Using Cloudflare, should the Name Server use Cloudflare settings, or stick with the host servers settings?

That’s very interesting @codinghorror, I’ve never heard that before. why would you recommend turning them all off?

We have 6 subdomains across three servers, in a fairly complicated build, they all have the little cloud switched on. We’ve also had issues with not being able to auto-renew our Lets-Encrypt, is that likely to be the issue we’ve had?