Hello.. Here's my config file for sgminer. It just takes time to find the sweet spot of most gpu. i start at a low memory clock and go the full range of engine clocks looking for a sweet spot. Low engine speeds is what really saves power. Also find the sweet spot before under volting. I don't have any guides. I use the normal vbe7.
http://i.imgur.com/D4GtGOql.png