If you are comfortable with the WHM kit I'd recommend dropping Largesse for something else (CS or E4E). Since a large majority of the WHM healing kit is ability based, your mileage for Largesse may be pretty low compared to CS or E4E.

I generally default Swiftcast, Esuna, Lucid Dreaming, Cleric Stance, and Eye for an Eye when I'm fairly certain I won't need to reapply Protect.

Also Surecast fringe uses include preventing knock backs so there's some applications for that too. Just be sure to understand how exactly it works before trying it xD