In the meantime, here is a bit of worthwhile reading that bears on the topic. Ultimately, the issue boils down to whether the buffering is occurring because of you, the client, or them, the server.
Buffering Myths and Solutions
Code:
http://iptvtalk.net/showthread.php?9846-Buffing-Causes-Myths-and-Solutions&highlight=buffering
A couple of user setting's threads
Code:
http://iptvtalk.net/showthread.php?8228-Some-Kodi-settings-to-help-with-Live-TV-Buffering&highlight=buffering
Code:
http://iptvtalk.net/showthread.php?8563-Constant-Buffering-fix&highlight=buffering