I noticed that too, the healing seems very minimal, it almost on par with Lingering Sustain except that this one at least it seems to crit? Sometimes i have seen critical healing numbers popping up from a target that i healed recently.
Soulweaver needs a lot of adjustment. That super healing that you mention maybe is because you were healing a target that doesn't have too much max hp? I play soulweaver a lot and i haven't noticed any difference.
How well you perform is random, my first try today was against demons(shadow demon, demon gorilla thing, fire archon) using my hellbringer warlock and i lost it at round 4, too much CC. My second try was against devils(Erinyes, Demon commander, demon wizard thing, Shocktroop Devil), this one was more tolerable since there…