As I have just started with CS after leaving CL I noticed they same, rejected shares around %21, stale shares and above target shares. Im running  six fury's with normal set up to USB hub to PC. I moved over to the test port 5555, so far okay but have only been mining it for about 1hr. Not sure what the fix would be for the fury's, would love to only get .2% -%5 rejection rate! LOL! Not sure if its the cgminer 3.1.1 since my config does not use the --scrypt in it. Or the pool can't handle the hashrate.   Not sure. Difficulty is set to 512 as per default for the pool, so maybe increasing that would help, what are you guys thoughts and recommendations?

 :)I'm happy with CS because of the transparency!


*UPDATE* So I let my miners run on the new port 5555, still high rejection rate, and now I see rejected worker temporarily banned..Miner SICK!!! OMG this is crazy! The constant shutting down and restarting is really killing me!