The admin side of my wordpress site is stuck in HTTPS and very slow as a result.
I am trying to set the admin to HTTP.
Here is my setup and what I've tried so far.

* Godaddy VPS with Godaddy SSL certificate
* In wp-config.php I have: `define( 'FORCE_SSL_ADMIN', false );`
* Tried installing the [wordpress-https](https://wordpress.org/support/plugin/wordpress-https) plugin. The admin https checkbox is greyed out / disabled.
Here are the settings on that plugin.
![enter image description here](https://i.stack.imgur.com/oQkX9.png)
* Check httpd.conf and htaccess files for any rewrites - none found.
* Server does have Vernish installed - asked Godaddy support to check for any relevant configs in Varnish. None found.
* I have tried commenting out code in wp-includes/functions.php based on suggestion [here](https://wordpress.org/support/topic/ssl-enabled-by-default-for-loginadmin-how-to-remove?replies=17) (see comment by user joelbair).
* I always flush caches, and sometimes reboot the VPS completely after making changes.

Any suggestions?
Could it be related to SSL signing certificates or how SSL was installed on the server initially?