How are you getting 10%? 1667/(142216+1667) = 0.0116 or about 1.16% stales, not 10%.
Edit: Oh, you're talking about SS:. What do you have scantime set to? Try setting it to 30. Also try upgrading to 3.3.1.
Also I see you're using I:20. What happens when you decrease intensity to 13?
I'll try those settings for a while and let you know. Thank you.
It looks like the default scan time is 30.
Changing to I:13 for 2 hours, I had 994 accepted, 26 rejected, and 4 SS discarded, so about 2.9%. But, my hashrate dropped from a hair over 1 MH to about 632 KH. I'll experiment with the intensity more later and see if maybe I can find a happy medium.
With cgminer 3.3.1 (and I:20) for 3 hours, 2661 accepted, 20 rejected, and 124 discarded, about 5%. I'll leave this running until tomorrow and get a longer average before I change any settings.
Thanks for the suggestions, it gives me somewhere to start.