You basically have cgminer using some default values. First, what is the temp of your card? You can see that at the top of cgminer when its running.
many degrees :70°C
in fact with that new card i was expecting about 10 times my current khs, maybe I'm wrong..
The temp isn't to bad, it can go to 75 without a problem when overclocked, in fact, that's the internal "default" target temp for cgminer. I run my 7850 at about 85. The reason I don't use a config file is to many parameters can be used and confuse cgminer. Cgminer is pretty good at self adjusting on most of the settings. Try a .bat file like I showed you and you should see a substantial increase in your hashrate.