Without knowing what your character’s stats are, it’ll be difficult to say what’s “missing” from your build. But yes, if you’re going low life (Exsanguinous/Last Steps of the Living) you want as little health sustain as possible to maximise the health drain which in turn maximises the missing hp & therefore the ward/sec.
I think there was a short discussion here as to what stats would give you the biggest bang for the buck.