Quote Originally Posted by whiteknight1_9656357 View Post
HR = bosses question.. I was close to killing Senator Fusus 98% 5 times at power 5.2k, I added gems,runes and several talents boosted my power to 6.0k now iam farther away from killing him best i have done is 80% same formation, then i moved formation around same results....why
You may have changed the order in which enemies die, which would change the target of skill attacks etc, which sometimes negatively alters the outcome of the battle.

Also you may just be having bad luck.