You do not need DL for CM or Prae, dps may need better weapon for speed run but I doubt a healer would need to be so well geared for it
You do not need DL for AK either, my friend, a healer did it with AF gear.
You do not need DL for Ifrit HM, good too have for Garuda HM as the boss hurts quite a bit more, and of course Titan HM you will need at least few pieces and sufficient HP.