Originally Posted by
Biomega
First of all, it's most important to know that you don't use Doom primarily for its damage, you use it for the Imps it spawns. As such, a damage buff (such as from Jin'rokh pools) will not be as important as having 100% crit from UVLS. As fights are currently, a 100% crit Doom always takes precedence over an otherwise buffed Doom.
Chaos Wave is used rarely on bosses, the only uses I can remember are Ice Walls on Durumu in certain cases, and Ball Lightnings on Lei Shen. Outside of that, its fury cost is simply too high to use effectively, not to mention that you lose HoG uses in the process. Similarly, Carrion Swarm is only used for snap AoE, not in a normal rotation.
On Jin'rokh, I think it's not optimal to blow cooldowns at start. You want to spend the time before the first pool building a nice reserve of fury, then unload it inside the pool with your cooldowns. Spam SF as your MC procs allow (never cast it without MC), ideally lining up with other damage procs. If you have 2pc tier 15, make sure you use up as many MC procs as you can during DS as the reduced cost is quite good. ToC is spammed when you don't have MC procs, Corruption is getting low on duration, you want to wait for procs to use with SF, or if your fury is so low that you risk dropping out of Meta prematurely (i.e. before another HoG-weaving cycle is up).
You mentioned Carrion Swarm a few times, but from the way you use it I assume you mean Imp Swarm. You should always use the Imp Swarm glyph. Keep in mind that it does NOT disable Imp spawns from critical Doom ticks, it only delays the auto-spawns from Demonic Calling (i.e. the ones from Shadowbolt/Soulfire every X seconds). You will want to align your Imp Swarm usage with DS as much as you can, unless you know you can get a full use of IS in between DS uses due to stacking haste procs. There are WeakAura setups that can help you track this, check the forum it's there somewhere.
I would suggest you take some time and study the Demo sticky thread at the top of the forums. Read through the OP, and through the last 10 pages or so - this will answer many of your questions, and load you up with many different tips and tricks for playing Demo.