T5 DPS concentration

[Lecreuset]

what I do for fast conflag is use any 2 CDs at a time except barrage and I put up flaming arrow when the fireball before that fast conflag is about to happen. When it's our heavy hitter monk/blm that gets in the fast conflag I use barrage+2 CDs just to play it safe.

don't forget to save your off GCD abilities like blunt arrow and I forgot the exact name of the other one but it makes you jump back.

Try to be familiar when the fast conflag is about to happen so you can use your dots on twintania for extra blood letters

Edit: I didn't fully read your post and only saw your main as archer so I assumed that's what you were asking

[Subucnimorning]

You can use IR and BfB for both fast conflags when they are up, I generally hit BfB when fireball goes off and hit IR as Conflag goes out. As long as you have a couple oGCD abilities up you should be ok, usually dies in 3 GCD's or so.