I tried your idea, but it was a failure.
Finally, I used a trick (but the mission took a lot of time) with my sith assassin: I killed the weaks first -> force cloak + respawn malgus (the poor guy was killed at least 7 times:p), i waited the end of the cd, etc etc etc until the jedi master was alone.
And some skills don't even work against them, for example "mind trap"
btw, the first group has a healer, you must kill him first
i don't know what the devs have done, but I read on twitter that players had the same troubles on Taris and Tatooine, with characters 70+ lvl. (against jedi)