You mine at 2048 difficulty? How do you know what difficulty is a good rate for your mining rig?
just make sure that you can submits 5 to 15 shares per minute.
When I look at the pool, it says I have 240s/s, I'm guessing that's 240 shares per second? I mine at 512 difficulty with about 15mh/s rig. Is 512 too low?