I've got all 10 up and running after a few resets. I changed the frequency to 756 and the difficulty to 256. I've posted a screenshot below, if anyone has any other tweaks or suggestions I'd appreciate it, thanks!
I have 6 running and vardiff is settling me in at 31m. Each stick is 744 freq and hashing around 4 Mh/s. Personally, I wouldn't use fixed difficulty. pooler knows what he's doing. Let the pool set the variable difficulty for you.