Your SSL setup seems to be all right. Just make sure your encryption mode is “Full Strict”, otherwise your site would still be insecure.
As for the 400 message, I assume you set up a firewall rule, blocking everything but the US, right?
sitemeer.com/#https://astralcomputing.com
If you have such a rule, the message can be explained with the 403 you are getting from that block. The Virginia checkpoint actually loads fine, however there’s a timeout in New York.