Soul Harvest and Firestone is pve shit cuz everyone can purge / spellsteal it. You can play SH vs a few comps like walking dead.
Play Fire and Brimstone for 85%.
Play coil for 100% of the games. If your healer gets a stun you want to double coil their dds. Its also a nice offheal / peel if they start bursting.
Use Dark Pact very early. Your pet hp wont last long.
Play double cs. Send your pet on their healer vs melee cleaves.
Play wreak havoc. You really want to do max pressure on two targets.
CoT and Netherward are the best choice. CoT on their healer and Netherward even vs DH/DK kicks.
Focused Chaos is just bad. You cant kill anything with your ST CB. Your mage will get the kills.
Cremation is good. You save so many gcds here and can spam incinerate for max aoe pressure.
Fel Fissure is really strong while you use wreak havoc and go double CB all the time.
Fel Fissure ms duration will be nerfed from 15 sec to 6 sec with 7.2. You better keep abusing it till 7.2.
If they have a kick up bait it with fear (or incinerate spam). Go double CB if they kicked your fear.