Still high dupe count with .99 KnC firmware

[NorTiaN]

I know this has been talked about before. Still, supposedly, high duplicate count is normally attributed to client side.
But I still find it hard to understand how the fault is on my side. I got my Jup and my Sat on the same ethernet switch, with same interwebs connection and still, my Sat duplicate count is always through the roof at the guild...
Running latest firmware as stated on title. Using bfgminer mod behaves the same...

Any new info regarding this subject?