Thank you, RequestedDeletion, for the link to the webapps common info.
It turns out the HTTP basic auth error is a bug in the owncloud distro and its sabreDAV config. I am going to wait and see what happens.
So, with that and the Strict-Transport-Security issue taken care of, it appears this issue is resolved. For the record, I used mmccarn's suggest of a template that add the directive to every ibay. It works fine today and I will keep an eye on it if we expand the use of this particular server.
Thanks to all. I appreciate the suggestions and information very much.