You definitely want to switch to use static IPs, that's a good starting point.
Please read this post:
http://www.chiefdelphi.com/forums/sh...3&postcount=16
I will not be able to 100% confirm it works until UNH this weekend, but I suspect you will see further issues if you use those gateways.
At the events, the gateway doesn't exist until you connect to the field. So in the pits, it doesn't attempt to route packets through the gateway. That being said on the field the gateway does exist, and as such packets are routed through that gateway rather than following the most direct path. It is my belief this causes the delays you see because of the way the FMS handles packets. We were seeing a 2 - 3 second delay with traffic that should have remained local in our case.
Basically I was where you're at after week zero, and now after Reading, I think I'm getting closer to a stable off-board setup.