Conquest Sector 2 boss fight feats(Victor)

so it's obvious the feats of this fight are buggy as hell. I've won with 5 people surviving and so i had 5 people with the victor buff and i did not complete the feat of winning with 5 victors (twice now). Then the other feat, win with an undersized squad. I went in with 4 toons and when i killed the second to last enemy, the last enemy left never got the Duelist buff so i could target them because they were the last left but i could not damage them... forcing me to quit the battle... Is there a specific way to make getting these feats less buggy? Because my cousin did complete the feat, or is it just an RNG thing and needing luck for the feat to trigger... For info i used DR lead, bastila fallen, malak, marauder, darth vader