I have a pullzone and it works good with my pictures in the uploads-folder but it don´t work with the resulted scripts from AssetsMinify inside uploads/am_assets.
For CSS I use another plugin, because I can insert there all css-files without issues (I don´t know why, but with your plugin I have to exclude 4 css-files, and that means more queries).. This plugin uses: domain.de/my-wp-content/cache/pluginname/file.css
CDN works fine with this css, it works also fine with the excluded js-files in the plugin-folders (I must exclude 3 js-files to unbreak my site )
(For a better security I renamed my wp-content folder)
For future releases it would be very fine to become the possibility to include external files in the minified scripts.. :)
Hope this questions are not to silly, I´m just a semi-pro..