It doesn't really matter what the healer has for most content as long as you don't do stupid things. I completed everything up to Ifrit HM in AF gear and only DL jewelry for Garuda HM the first time i got a kill on it and didn't die. The only thing DL is useful for is Titan and beyond where there is tons of damage for everyone to absorb and it helps you survive.

CM and Prae and even AK are cakewalks when you know the fights. You don't need DL for those because you won't be taking much if any damage.