Have you tried switching to SEN/SEN/SEN for his Screech? That's one paradigm I started using a lot later in the game. SENx3 just to survive it, SEN/MEDx2 to heal up (if using a fulltime tank, which you probably are on this fight), then back to doing whatever I was doing.
Or you can cheap it and use Death on it. I'd say only resort to that if you can't beat it otherwise, but I think you should be strong enough if you have 15k HP.
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