For redirection to SSL you can find detailed instructions how to configure SSL with Sitefinity in our Knowledge base. Please check this article.
Each sitefinity page have a page property require SSL, go to Actions->Title & Properties of a page check the checkbox require ssl, the site must have binding in IIS for https on port 403 and the settings from the KB article to support SSL, this will remove the need to have a rewrite rule. Please let me know if the approach works for you.
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