The caching is not a bug which needs resolution, it is intended to aid customers with performance of the site for individuals who may not need to see a live version of your site. Keep in mind, it is not a rolling 15 min but rather 15 min since the guest hit the page that initiated the cache. Unpopular pages, this likely won't even be an issue as you're describing but popular pages, most who want to contribute and stay up to date will login/register anyway, so we have found little in ways of feedback against this from our Cloud customers. However, if this is an issue, you're welcome to provide your suggestion in our Feedback forum.