I've confirmed that your WP caching plugin is no longer enabled by trying another URL with a different query string (I've explained above what this is but I can again in a separate reply if it makes things more clear). http://keyflowfeeds.com/feed/podcast/?random-string=124 (no comment at bottom of feed, and this feed URL is valid).
This means something is still providing a cached version of the original feed, either something remains in the .htacces file or your web host is also providing caching and you need to clear that as well.