@heydonworks @andybelldesign DNS is such fun. 😕
I'd recommend looking over in the DNS topic over in the @Netlify Community. You might find that this has been asked and answered, or at least have access to more brains and eyeballs to help.
https://community.netlify.com/c/topics/dns
My tweets and posts live here on my own domain these days.
You can explore them here and follow me on Mastodon instead of Twitter where I'm not currently active.