Feel like I have too much downtime as a Necro? Lvl 16-17

[Ikon]

Other things to consider:

Heartflutter seems to resist way too much to be worthwhile.

I found the following is best with pet tanking:

Leech
*Send Pet*
Heatblood
Engulfing Darkness
Fear (when mob hits 50%)
Pull pet.
Refear or use Shock of Poison till dead.

Leech is low aggro and pet will pick up aggro straight away over darkness. Heatblood won't take aggro off the pet usually* By the time you cast Engulfing, likely won't take aggro but might. Benefit is also that you won't be recasting darkness before the mob dies. Pet is basicaly just a damaging root while applying dots and pulling it back around 50% means full exp.