Did a search for you, and found this following thread.
try adding --klondike-options 350:65 to your .bat file. I use this for all 3 of my Klondike K16's and I get 5.5-5.6Gh/s each. If you need more help let me know.
thanks for the tip, I'll be sure to try it
No problem. I let mine run at that speed for a week and they ran stable so I bumped it up to 360:65 and pointed a box fan at the back to help with cooling, now all 3 together avg 17.05Gh/s.
Maybe you can try to use --klondike-options 360:65 and hopefully you will get ~5.7GH/s.