Hey Lickman,
Post your clocks and your config file and we might be able to help you out.
You will find that Scrypt is a very different beast than Bitcoin and that you need to retweak everything separately to get the best out of it.  I have heard that for the 79xx cards the sweet spot is something like Engine clock = 0.7 x Memory Clock.  You also need to up the intensity a lot compared to Bitcoin, maybe start around I = 13 and tweak your clocks, then push intensity up to the limit of your rigs stability.  Check around the forums and see what settings other people are using.