As Affliction is based around building your dots up, having that many random factors involving your dots and you gaining litteraly nothing out of a proc if you dont run it on your dots, you simply want to swap towards stable build up damage like Wush / Breath etc. Breath + Wush should line up really well on a opener as Affliction too. Sadly havn't had the pleasure to obtain wush and im switching more towards Demonology / Destruction then Affliction these days.
Metagem gives you a 10-15k~~ dps increase as AFFL, 6-10k as Demonology but only like 2-4k~~ as destruction. So as soon as you get the meta gem, maybe its time to go back to Affliction / Demo.