Can't Keep Aggro? What?

[Xarah]

Your rotation is fine and will keep one target on you. What you need to do is keep switching targets and use your combo on the adds. Your healer especially will be getting steady threat on ALL mobs in the pull and will eventually exceed the threat from your two flashes, unless you keep switching to the other targets and building threat. You can also spread your combo among targets. I'll often Fast Blade, Savage Blade, switch to target #2, Rage of Halone, then switch back, and so on.

Which reminds me as well, use marks so your DPS knows what you'll be focusing on, and prioritize your threat building in the order you've decided. Just remember, your job is not to focus one mob, your job is to keep ALL mobs in the pull on you, so switch among them often.

Edit: I also have to point this out since other people are mentioning it: Provoke will not do anything at all for you if you already have aggro on a mob. Provoke is only useful in what's essentially an emergency, when you're far behind on threat and need to catch up instantly. Provoke does not build threat, it simply places you just barely at the top of the list.