However, it'd be nice if there was a more precise ability that could arc over the front ranks and hit high priority targets in the back like casters. I think Bola would be a good candidate for this. Bolas are a heavier projectile that would require being fired in an arc. The DH introduction video shows the DH launching a Bola high into the air to kill a demon. The arc would also allow you to target enemies in the middle of a pack, optimizing its AoE.
Another cool addition would be to make one of the runes cause the bola to go around the neck and choke the target, increasing cast time. You could add this on a current rune effect.