I've been playing the playtest Necromancer for a while. I'm still at level 6, so I might not see its full scope, but I feel underpowered compared to everyone. I cast one or two spells in combat, but I don't feel very impactful.

First, thralls are slow to set up, and I need them in a specific position. In theory, they're cool, but in practice, when the map is wide and the creatures are large, my Bone Spear can't even hit two targets. Sometimes, I can't even cast them because of the range.
Does anyone have experience with the Necromancer or Occult Spellcaster who can give me a few tips on how to make it useful in combat?

We have a healer, an animist, a barbarian, a warpriest, a wizard, and a magus.