Just did a run-through and got the compliments, here's what I did. It's mostly darkside, as the choices are essentially doing what the mission logically would call for. You're an agent of the Empire, not an agent of mercy - but you're also not a total psychopath.
Killed the guy who calls your bluff, he could be a liability to the mission.
Killed the people who broke into your room, they've seen too much.
Play dumb when Kaliyo questions your ties.
Kill Karrels, though I chose option 1 over 3.
Attack the alien who ambushes you in the palace.
Don't try to tamper with the disc before turning it in.