heh, i think you've got the right thread!

I know exactly what you mean - i had exactly the same problem! I don't think that there is a 'perfect' way to do this fight, but i'll tell you about how i did it:

I tried to do this fight with brute force at first, and i power leveled up to about lv 50 - still couldnt win though (using Vaan, Penelo, Kytes, Llyud and one other (forgot who)) . when this didnt work, i decided to become sneaky, Wings is a melee fighter, so i changed my team to Vaan(dual attack gambit) , Penelo (Curaga), Llyud (Revive), Filo (a roundhouse blow with the board) and Kytes (blizzaga). My espers were mainly flying types, melee to distract the judge and carbuncles for penelo. I don't need to tell you how i dealed with chaos, but with the judge I tried to distract her with Vaan and the melee espers, whilst Llyud and Filo chiped away at her health (Llyud occasionaly reviving Vaan) Penelo healed with her carbuncle and i physically controled Kytes, using blizzaga and other spells on enemies that came near, and in the lulls between the waves, i used offensive spells on Wings. You will definatly need to keep re-summoning the espers. I barely survived this, if you ever are near death, RUN! If you have penelo or Llyud still alive, you can revive your allies, but wings will probably follow you, so you should loop back to where your allie are. Keep trying and you'll eventually win this battle.

Hope that this helped!