There are not really any infos available. A quick search gives me this and this. (So much for “everything old PVE has been solved”)
By the looks of it, you need to tank very specifically against the damage types the NPC mostly deal. For instance, if you fly the mission against Guristas, tank a lot against Therm and Kin. And fit an afterburner if you don’t have already. Kill all webbers first so that you can move faster and start to sig tank the NPCs better. Alternatively, if your tank holds with minimal movement, kill the tacklers first and then the webbers.