Hello.
I investigated the conflict and I found out what the reason is. Unfortunately, I think that with the way that Virtue includes it's template can't be customized unless I change the plugin to work specifically with that theme.
Since I don't want to blame the author directly and I'm not 100% sure that my approach is fully appropriate, I asked a question at StackExchange: http://wordpress.stackexchange.com/questions/160850/what-is-the-right-way-to-replace-a-post-types-template
I'm going to postpone my next post in this thread until I have an adequate answer there.