Okay, we're a bit into Warlords now, and I haven't been entirely satisfied with the numbers my rotation was putting out. Since I absolutely love the concept of Exotic Munitions (specifically, of fire arrows, which I've wanted since Vanilla), and I'm frequently the raid's battle rez with my crane, I'd been using this cast sequence still:
/castsequence Chimaera Shot, Steady Shot, Steady Shot, Aimed Shot, Steady Shot, Steady Shot, Aimed Shot
But I've been drowning in focus. Just drowning in it. So I put together this cast sequence to work with:
/castsequence Chimaera Shot, Steady Shot, Steady Shot, Aimed Shot
The difference on the target dummies, using Murder of Crows, Glaive Toss, and Poisoned Ammo, was a bump from ~15k to ~16k. Moving in a positive direction!
But then I decided to try Focusing Shot, since I was frequently getting Glaive Toss or Crows in between my Steady Shots when I wasn't paying attention. The first attempt went badly - I just shoved Chimaera, Focusing, and Aimed into a cast sequence, and I was again drowning in focus and clipping cooldowns. Based on those observations, I put together this:
/castsequence Aimed Shot, Aimed Shot, Focusing Shot, Chimaera Shot
The results were markedly better than either of the Exotic Munitions tests: around 18.5k. That's an improvement of about 3k on my average dps right now; with raid buffs that will likely be even better.
What I'm not sure about is movement: Focusing requires not moving, and there are some fights where movement is important. I won't get to test this in our raids again until Thursday due to work, but I might hit up LFR before then to see how it shakes out.
Either way, with or without Focusing Shot, this is the first major revision to the cast sequence in what, four years?