Ok, just to review... remove the http/https redirect from the .htaccess
Use the port forward in the domain's custom vhost entry section (Module Admin>Apache Config>Override a Virtual Host>[select domain]
Port Override = 443
Forward Port 80 to Overriden Port = check
Use the port forward in the domain's custom vhost entry section (Module Admin>Apache Config>Override a Virtual Host>[select domain]
Port Override = 443
Forward Port 80 to Overriden Port = check