I dont know if this will help but it's better than not responding.
I have the same router.
I put the wii mac address in my mac filter list
I turned on DMZ instead of using the specific ports that the wii needs. I believ the DMZ opens up all ports.
Find the address of wii from dhcp client list for the dmz entry
wireless network mode is mixed channel 1
And make sure on the wii end you have it set up with the wep key