did you really find that deathstalkers did enough damage to raise them over flesh recluses in a 100 damage game? or did you really not have enough death?
Normally i dislike deathstalkers, but they have a few advantages in a deck like this. First there are 9 separate buffs in the deck, so they will generally not sit unused. Second, healing makes up for poisons naturally slower kill rate and also poison cannt be removed which helps in case CC creeps up. Finally, with momentum + nightfall + epi + deathstalker + TU (big combo, but I've done it more than once) you can pull 32 unblockable damage in a turn (8 poison counters).
Since the deck runs off supernovas, I have the choice of 2 stalkers or 1 spider. Stalkers nicely run off 1 supernova where it takes 2 to play a recluse.