first boss, dps the boss, keep earthshock with 9 stacks ready for chains to oneshot them and run out of range
the adds should get killed by fire elementals/nova/thunderstorm and the tank, oh and yeah dont forget to run away when the adds are comming, they are spawning below each party member and deal a lot of damage when poping out so you have about 1-2 sec to run away when he's casting quake

2nd boss, well I'm uploading a video, not really hard I'm taking 2 beams and the tank the 3rd