My choice would be Tantra Cyclas +2 during TP, Loki's Kaftan for WS when Impetus is down.
Sounds like you haven't done the upper tier VWNMs yet. Cure6 can come in handy on some of their moves.
With all the debuffs that need to be taken off people and the damage dealt to healer-deprived parties in the alliance, I am usually casting nearly 80% of the entire fight. This limits the number of cures I toss, forcing me to use C4-6 exclusively. Gnostic drink is your friend, as well as a decent auto-refresh set. MP rarely is an issue.
Limiting C6 to a cureskin role seems suboptimal for the situations where I am required to come WHM (VWNM, which my LS does 80% of the week right now).
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