Thanks for dragging a thread back from the dead 2 months later. You also need to proof read and fix all the spelling and grammar mistakes on your FAQ.
Think I'll drag it back up after several weeks of being dead as well........
because I'm getting tired of all these guides saying that latency is the most important factor. Use simple logic to discover how many interrupts you should expect per minute, i.e. 8 interrupts per hour w/ 100ms difference (say, 150ms latency vs 50ms) = 8x200 (round trip because share->server and new work from server->peer) = 1600ms. That's 2.667% more DOA. Comparing pools, if pool X has an absolute value of 3% more orphans than Pool Y and is 50ms, vs the 150ms of Pool Y, pool Y is still better. Your cgminer stats might not look as great, though.
There are also lots of pools that will get lots of DOA regardless of latency (like p2pool.org).
I don't know anything about gridseeds..