Few problems I see in your video:
Number 1, and probably the most important is, get off of PLD, and put on a big "I HIT SHIT" Axe.
Number 2, you use Aegis right when he readies his WS, therefore you cannot move for a sliver of a second, which caused you to die.
Number 3, you have to anticipate his WSs. Every other melee move (under 50%) he will use a WS of some sort. If you can dodge 3-4 WSs under 50% it should be dead. If not, then get better DPSers.
Number 4, if none of this works for you, stack HP gear, get on WAR and grit your teeth as he swings on you leaving you with 400-500 HP
Hope this helps.