Heh, Ulver is one hell of a band.
Also, some stuff, you can't always do without truly screaming (as in screaming at talking level VS truly screaming). One of my brother's friends has a crazy grindcore band, and he does the vocals, and he's not one to keep it down when he screams, lol. And it shows. So yeah, if you haven't already tried, try some of your screams at full volume (somewhere where people won't hear you, lol).