Regarding the nar shaddaa 4-man heroic with the mandalorians, its certainly not the most easiest. We had hard time with 3 over lvl 25 and me tanking at lvl 23 or so. Had to take it very carefully and cc atleast 2 elites of the 3-4 that were attacking. And we had one sage, two scoundrels and me as shadow. Wiped once at the start because we thought that we would have enough healing, turns out we didnt.