With Jindo Krey:
As soon as the ship comes down USE THE TERMINAL that the ship is out don't wait for 200% + (Level 2) to rise otherwise you will get 1 shot from his missle's.
Make sure you are interrupting as much as you can an DPS through his shield.
With HK-47 -
Make sure each player is standing in a circle so when he randomly targets someone they are the only Person getting hit. When the turrets spawn you have to break their green shield with the missle that he targets someone. So what we usually did was get all DPS to stack on one until it targeted them broke then moved to the next one. Once both of them are broken just DPS the boss then the turrents.
DON'T TRY AN DPS HK-47 WITHOUT BREAKING THE SHIELDS or they will kill you.
You should break the turret's shields but if your healer is good you don't have to kill them. We left one turret alive but didn't destroy its shield before killing hk-47 and the turret got bugged and we were left in combat. The enrage timer is quite tough so if the group doesn't have enough dps you might need to skip the turrets. Even though you skip them you should break their shields.