That's not enough. You have to set up a DMZ on your router with the IP you assigned the Wii U.
Also, for the DNS, Nintendo suggests 22.214.171.124 for the primary and 126.96.36.199 for the secondary.
yea so i'm kinda tech-stupid. have ZERO idea what this means other than changing my DNS values i guess.
Either way i played several matches tonite and only dropped to that dreaded 1 red bar a couple times, and it only lasted a second or two. I can still tell that i am on the wrong side of the lag fence a vast majority of the time, but it is atleast playable now.