Also watch the D'deridex's status indicator for when he queues up High Yield Torpedoes, and either get into his side arcs or Evasive out of range until that 30 seconds is up. Time for your skills to recharge anyways. Also some kind of spamsweeper ability like Scatter Volley 1 or Fire At Will 1 will help neutralize both the torps and the cloaking mines.

The D'deridex's entire skillset is built around "I hold you in place, then hammer you," so if you take one of those halves away he becomes much less dangerous. Honestly I have more trouble with Mogai's than the big birds.