Well, I think that was just a whole lot of luck.
This is just stupid, pumping milions of credits into toons that just suck (farmboy, st-han) and that I wont ever use anymore.
My best strategy so far:
Stage 1: Use Specials, try to beat them with full force as soon as possible
Stage 2: Only use specials in first round, have them all cooled down before the end
Stage 3: Use Lukes special on the two Stormtroopers on the far left and far right (the ones that have crit immunity) in order to remove that. Use smokescreen on R2 first, then Leias Special, then Leias Basic to defeat the outer two Troopers. Then when R" is almost gone, use Hans Taunt
My best try so far was Leia against two of the (inner) Stormtroopers.
Well, there are 6 days left, mybe get some mods to 15 during that time...