Rewriting all HTTPS to HTTP

Trying to do this.. and failing. I can get the main https://mysite.com or https://www.mysite.com to rewrite to http://mysite.com but nothing else will.
Options +FollowSymlinks
RewriteEngine on
RewriteCond %{SERVER_PORT} ^443$
RewriteCond %{REQUEST_URI} !^/wp-login\.php
RewriteCond %{REQUEST_URI} !^/wp-admin/
RewriteRule ^(.*)$ http://mysite.com/$1 [R=301,L]

I’m needing SSL access to the login, and admin as well. Though I need every single post and page to redirect to the http://mysite.com/post version etc.

Thanks for any and all guidance.