If it ain't broke, don't fix it. ::laugh:: With two Xbox on at the same time you can't really use custom gamefuel or port forwarding (AKA Gaming) because that contradicts UPnP. And looks like Gamefuel is doing a well enough job. Just keep in mine, you may experience lag for reasons that have nothing to do with your router, so don't go poking around the first time you have a issue. Just some friendly advice.
Oh, and save your config file.