I would'nt say when the stars align is when you would do more dps. Its more of a matter of how well you weave in your PS,HT and NS,HT into your rotation and keeping high uptime on those bleeds. And yes a miss will consume a charge of DoC. Your stat prios look good to me.
When using simulation craft stat scaling it will say Mastery->Crit->Hit/Exp cap->Haste
You want to know that if you do this properly it will run the test 10 000 times and simulate a average dps through all dps tests.
Some tests of our 10 000 times could possibly hit all spells and some test might even miss 20% of all spells if those spells where missed when a DoC stack was up it will be a major DPS lost.
I'd say mastery is still very strong; So i'd generally say get mastery on all iteams through,
the weakest stat then look for Hit/Exp reforge on iteams that has mastery as a base stat... Yes i do not have reforge like that currently but that is because i've tried different forges and been slacking to get them back.