I run 5/1/1 atm, with 5 Hundingds/1 Molag/and rest NIght Mothers Gaze, pure wpn damage spec with around 2k+ sustain, and 3 Agility Robust
You can play stam nb builds with vamp and although the ulti has been nerfed to the ground since the good old days of dk vamp emps hehe.
They are viable with Clouding Swarm, but WW is arguably better IMO, as its very hard hitting, Howl of Agony morph can hit for at least 17k, more with procs, and is possible to rip apart small units in PvP.
I use Warrior stone for extra wpn damage, but may swap for Thief/Shadow.
Completely max out Mighty, that is the staple of your weapon damage, giving you 25% extra weapon damage, and find a good balance between weapon damage and regen, e.g a lot of points into Mooncalf for stam recovery or mix your enchants at V16 for opimal balancing between regen/cost reduction and weapon damage.
In duels I can in most cases burst my opponents down to around 3 seconds, dead.
And only currently at 487 Champion Points.
Just play about with your build, see what you want, there are varying builds for stam nbs, whether you want a high crit build, using dual wield daggers, with Shadow as mundus, and crafted gear that compliments your playstyle which I am still not sure of?
I can help you better later