Spinal Shivers isn't really that good on a Dervish. Despite 4 pips of regen, the class still runs out of energy quite a bit if you over do it and Shiver's/Spinal can drop your energy faster than anything. Unlike say an assassin, Dervish can't reclaim (non-pip) energy by just hitting things and getting a Critical. While playing mesmer, I've Power Flux'ed a few Dervish and they always struggle to keep themselves going.
It may be easier to use Spinal/Shiver's with Zealous Vow at high Air Prayers coupled with Heart of Fury. Still I doubt it's worth it.
Running hexes is a good plan though as Rending Sweep is an awesome skill. Parasitic Bond is always good. Rigor Mortis is gorgeous. While it's better having an ally casting it for you, it's still a good for those blocking foes. Defile Flesh is a stretch but it can make foes very unhappy.
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