Here it is! About an hour ago I added the no-submit-stale just so I don't see the stales rising constantly.
Difficulty is set at 16, the GPU's are 5x 7950's.
Nothing's really jumping out at me.. Can you do me a favor and run a traceroute to the pool from your IP address? Maybe there's some kind of asymmetric route or something that's causing network issues.
Here you go (note that with whatever coin it's on now, it's at 10% or so it looks like. It jumps up considerably on some though. I attached CGMiner to show the GF/RF's as well):
What's weird about your output is it doesn't say "stratum from pool 0 detected new block" before the stales.. So why are they stales?
Also can you PM me your IP address so I can run a traceroute back to you from the pool server?