try doin it like this...
1st bring out ur weaker chars then perform quickenings on him...make sure u make a good combo...
then bring out ur TWO strongest chars!(3 chars is only good for damaging, but it burns MP and u waste too much time buffing, reviving, and face it they are not intelligent enough to make a 3 way attack)make sure u use a gun or bow,but gun is best coz it pierces...give ur other char some sword and shield..Let ED beat up ur other char so u can stand there safe and u do the healing manually...ur 1st gambit should be haste on all,2nd KO=phoenix,3rd esuna=negative status,last curaga=ally <30% HP (in case of emergencies), the rest u do it manually...just dont let ED notice u or its gona get messy..>>>its also a good idea to use potions for non-delay actions