OK so in directive 7 there is the first boss you will need to run past and then restealth. Then knock over the tower on you way to the 2nd level you will see a spider droid ahead of you on the stairs and to you se and east if you get aggro there is a fire that will kill all of the bots be careful not to get in the fire your self and take to many on. you can kill the second set of bosses with the shields too this way if you take you time you can complete your first part of the bonus mission and skip one of the crappier fights. once you clear the second bosses there is another chest inside to the left and u can stealth there too and if u back up into the corner you should be able to get that one too sorry if my english is bad but i wanted to contribute also you can reset it and redo it for scavenging possibly also not sure yet since i dont have any friends who can stealth and are scavengers its possible please let me know if this is possible