Tbh if you have 27k hitpoints then i am wondering how low your other stats (def rating, shield rating, absorb are)
Our main tank has 25k hit points and is fully geared in rakata/black hole and 2 campaign pieces with augments, he is actually trading off endurance if it gets him better defense ratings. (also assassin tank)
Was thinking the same thing. You really dont need that much health. you would be fine with around 22k as long as your defensive stats are where they need to be.