Remove the life.
Once you've done that, add some death pendulums, normal poison, dusk mantle/vampires.
Whilst it looks nice to have adrenaline on death stalkers, that's only two more poison per stalker at the cost of making your deck a trio. Not worth it, imo.
Adding vampires gives you some more healing to play off the nightfall (I might consider tossing a fourth in) and death pends makes the deck more stable. I would add some pends and replace some bone pillars for pends.