Just got to this mission myself. 47 immortal/jugg. Silvers were a pain. First match managed to kill one before I died, respawned and killed the other. Went to get the other generator and kept wiping, couldn't even take down 1. Quit for the night, found this thread and went back the next day. Used Vette, punted one off the edge, killed the other. Vette went chasing after the other. I hit the generator while she did that. Vette died, but 2nd silver was down to 50% health, easy to finish off.
The boss was a pushover compared to the silvers. Only defensive ability I needed was ward.
In general though, Voss was a pain. Died more on this planet than all other planets combined. Quinn, Jaesa, Vette, didn't matter what companion. I ended up going with Vette for most battles has her ranged kept her out of the way of those fire probe things.