You should be using every dps ability you have. (and no, hand of reckoning is not a dps ability! lol)
As ret your goal is to always be using something as soon as it's off cd.
First come first serve rotation is what it's called, and basically it means never wait for something better to come up, ever, just use what's up. (more on this later)
When 2 things are up at the exact same time, then you consider priorities.
Currently, priority without 2t9 is:
HoW > CS > judge > DS > Consecrate > Exorcism (swap cons and exo priority on ud/demon)
Priority with 2t9 becomes:
Judge > HoW > CS > DS > Cons > Exo
Now, when you get really good, the "first come first serve" becomes less of an absolute. It's still the primary philosophy, don't get me wrong. But, you can get used to the exact dps numbers for the different abilities, and you'll find situations where, say, exo is coming off cd, but judgement will be off in .1-.2 sec, and is therefore mathematically the right choice.
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