Raging Strikes is good to use often but use quelling before
Mass pulls would be a situation were you Raging, as you need the every little bit of dps.
Also if thundercloud procs and Firestarter at the same time it is best to use thundercloud first as there be chances that it can proc again.
Does not happen often but i have already have had Firestarter proc and thundercloud 3 times in a row, it was rather nice :P
What do you have for gear scarebear if i may ask, i have a mix of weathered, myth and allagan atm and currently sit @ ilv94. Just Zenith weapon as well