Everything worked fine until you added an Alias to your vhost. The Gunicorn requests are working but none of the ProxyPass requests are being processed.
Did you move the webroot from /var/www
or similar to something like /srv/apps
?
chcon -Rv --type=httpd_sys_content_t /srv/apps
http://www.petefreitag.com/item/793.cfm http://wiki.apache.org/httpd/13PermissionDenied