Some of these WSs are useful, my eye being on Catastrophe, which would answer my scythe Drain WS suggestion.
Cata drain is sucky and heavily prone to resists giving back minor hp drains and also can miss, on mobs that matter you don't drain back enough hp from the ws for it not to kick your ass. It's pretty nice on low stuff but then you can just sub dnc and be just as good anyway.