How do I snap taunt?

[Cyrus-Wallace]

As for Titan Egi, I personally precharge my halone combo on titan, and land RoH on the west egi the moment it spawns. Next, Spirits Within/circle it, and run east, uncharged rage of halone on east, followed by flash spam on both. For this to reliably work, it is very helpful for a melee (mnk/drg) to intentionally tank the east egi for the first few seconds.

I do it the same way. It works.

But as Kseven says, you gotta know the whole encounter first, so you can pretty much anticipate the splits/spawn/whatever. Having your RoH combo pre-loaded is very helpful in almost every encounter. Using the RoH skill alone (no-combo) is useful, it generates some aggro but with like 160 less potency. Rely on that strategy when you know that add won't be nuked asap, for example in Titan Ex, where you'll be using that on the second add. The usage of your off-GCD skills is very important as well, so you "fill" the DPS/aggro you generate in-between the skills.

Try using some macros too. For example:

/macroicon "Circle of Scorn"
/ac "Circle of Scorn" <me>
/ac "Flash" <me>

This way you use a off-GCD skill along with an aggro generation skill with almost no-delay.

Edit: I forgot to mention this, but Fight or Flight is helpful as well. It increases your damage, hence your aggro generation. Pop it before the add spawns and it'll help you a lot.