You were probably using older .bin files before which were compiled on a different Catalyst/SDK combination that was more efficient. So you can either try to backlevel those to the earlier configuration or just keep what you have since it is working.
Thanks for the advice. How would I go about doing that?
By installing older Catalyst/SDK combinations that you had used previously, delete the .bin files in your CGMiner directory and run CGMiner to create the new .bin files for your new configuration and try it for a while, then repeat.
It's allot of trial and error. Which is why I also said your other option was to keep what you have.
Good Luck,
Sam