Desecrating Essence, Demon Maw, Burn to Death(EoX), Pillars of Infernal Flame 2, Fire Lance, Burn to Death, Pillars of Infernal Flame 3, Inferno(only if it is at a 9 or 10 stack. If not, continue with normal rotation), Flame Lash, Avatar of Xotli, Burn to Death(EoX), Inferno Curse, Pillar's 2.
Continue with this normal rotation. When Avatar of Xotli is about to expire, use Demonic Supplication and cast Desecrating Essence.
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Now, if you prefer a Hellstrikes rotation, you rotation is a little easier.
The buff rotation is the same. But the combo rotation is Burn to Death, Hellstrikes 6, Molten Steel Slash 6, Burn to Death, Hellstrikes 6, Molten Steel slash 5.
Just rotate that general rotation and you should be fine.