about that guide for the PSN setup...
i must say you have done WAY too much for a Type 2 connection...
there are two things you really have to do after reserving the local IP...
1.) simplest of the two, DMZ the PS3
2.) since all PSN activity routes through certain ports just port forward:
TCP: 80,443,5223,10070-10080
UDP: 3478,3479,3658,6000,10070-10080
that is all you need to own on the PSN.
The Gamefuel rules on the DGL-4500 are useful if you are not using the wireless on the DGL-4500, if you are using Wifi well, i haven't found a local work around for the DGL-4500 and its dropping Wifi issues yet, but if you have a spare router you can set it up as either a Switch/AP to maintain 100% uptime.
IMHO there is no need for the Gamefuel if you have UPnP active on the router, the PS3 will take care of things once the ports are opened properly.