You need solid interrupts on all the adds. The hardest doors are 2nd and 4th which are heavy interrupt doors.
If you feel like your getting swarmed by adds , knock it down to 2 healers as your higher dps will deal with the adds way quicker and you will bring less stress to the healers. The more adds the more healing.
Save Bloodlust to burn the boss in last phase after the 4th door opens and you should get it quickly.
If someone is scumbagging on the boss the whole time then give them a worthy slap
. every dps should be on adds until last phase as the burn is so fast
Its one of those fights to be honest once you get the 'flow' of it everything falls into place and you will be constantly getting it.
The main progress is the doors, you will find you clear each door better and better as you go then finally hit last phase and die due to raid dmg, once you have that grove you got it!