Hi,
When you set the Cache Control policy to "cache without proxy (private, must-revalidate)" it sets the Cache Control policy to "public, must-revalidate".
I tested this with version 0.9.2.11 of the plugin.
Here is a patch that fixes the problem:
https://gist.github.com/georg/1319fb718fb4b1e519b0
Cheers,
Georg