I would suggest impersonating other encrypted protocols with heavy traffic like encrypted BitTorrent or P2P Skype (is it still P2P or MS centralized it already?

I would suggest impersonating other encrypted protocols with heavy traffic like encrypted BitTorrent or P2P Skype (is it still P2P or MS centralized it already?). On the other hand, systems administrators are frequently blocking BitTorrent and Skype traffic so the "TLS" traffic on port 443 has more chances to pass.