I just wrote this in the mega thread but ill copy paste it here, mayb it will help you.
Finally beat it. Chirpa(L)(g8) / Teebo(g10) / Ewok Elder(g8) / Ewok Scout(g8) / Paploo(g7). all 7* except paploo at 4*. With some average mods on them all. Also all lvl 85 except paploo at 65
Use teebo and paploo to dispel the speed ups and other buffs on the enemies, use paploo to put speed down on the at-st or one of the stormtroopers on p4. Also use paploo to call EE to assist as his basic can give lots of TM to the whole team. Dont use the group heals until after the at-st does his aoe that dispels and puts daze so you dont waste the buffs. Dont forget to use teebo's invis skill at the right times cause if your teammates all have daze then they wont get the 100% TM, same thing for the mass assist call that I think chirpa does.
Hardest part is p4 where there are 5 stormtroopers, the middle one does an aoe heal so I would go for him first. then the 2 to either side of him will taunt so remove the taunts and focus the outside troopers first since they do more damage.
Hope this helps someone, GL