Good for you. Seriously. A few things:
1) How do you resist popping meta in the gauntlet, then using Charge, Immolation Aura, and Challenging Shout at the same time? I can't.
2) Timing is important, but MORE important is using it every time its up in relation to the importance. For example, ask when they plan on blowing heroism. Smart guilds will do it at 30% (most bosses) to maximize execution damage. Popping meta during heroism/bloodlust is the most important thing you can do, so time it for this then back it out so you know when to blow it sooner.
3) Soulfire rotations are badass if you can manage it.
4) Don't forget to ask your healers about the extra 300 spell power and see if they've noticed a difference.