Devastating Attack should work on Grenades, too, making that 5 points lower. But agreed, Adept Negotiator path is a good one, too.
I had the coolest thing happen in our last game session -- the aforementioned jedi had to fight a duel with a Dathomir Witch which hated Jedi, for the freedom of the other witch from a vow she took. The Witch broke the combat rules by trying to kill him, and he managed to force stun her all the way to unconsciousness, even though he had the means to force grip her to death, and would have had an easier time of it, and he did struggle with the choice in real life, which everyone at the table loved. I gave him an extra destiny point for the great RP.