I'm currently running demo in our raids.
I use life tap/felguard/quick decay (bringing my corr to around 11sec duration).
http://talent.mmo-champion.com/?warl...10NUSR4,,10958
This is the build I use.
With this build it isn't feasible to spam incinerate, as you are lacking many of the incin buffing talents from deep dest.
I cast cod immo corr sb. Spam sb till MC procs then cast incin 3x (above 35% mob hp). A helpful trick if the boss has adds and assuming you aren't assigned to them is to cast a sb at one when it is less than 35% hp. You can then use the decimate (10sec duration) to spam soulfires at the boss.
Basically keep all your debuffs up including isb. Watch for MC procs. Spam soulfire under 35% (but keep your dots up!)
Use Meta and Dem Emp on CD or as pertains to the specific boss. (ie on twins 25 heroic we save all cooldowns for the dark shield as majority of the raid is wearing dark essence).
If you have haste use items use them before casting corr as we don't get to refresh it it will tick the whole duration super fast and likely proc MC at least once.