I'm more curious about the difficulty setting of 19. What's up with that? I use a value 1000 with my two (total of 600 WU/min).
.earl
ckpool's auto adjusts the difficulty depending on your equipment mining speed / number of shares so in this case its adjusted to 19 diff.
You can set a suggested starting diff in cgminer by using --suggest-diff 30 which is what I use for my stick. This doesn't work on all pools though.