Sometimes you will also have a WHM that pulls a ton of enmity from over-heals, and two very good DPS classes that don't manage enmity perfectly. I like this simple combo, a Variation of what some others have been saying. Also I just wanted to note that there is a 1.5s internal cooldown timer on EVERYTHING (even off-GCD stuff), so popping 2 off-GCD abilities in a row is kind of a waste. You could slot in a more powerful GCD abilities between them to maximize efficiency, as such:

Flash (GCD Invoked, 1)
Circle of Scorn
Flash (GCD Invoked, 2)
Spirits Within T1
Flash (GCD Invoked, 3)
Fast Blade T1 (GCD Invoked, 4)
Apply Enmity as needed.

I start off almost every fight I can with that combo, as it is a generous enmity lead on all targets within 3 GCDs