i play BLM as a main, and have completed alexander turns all of them over 1100 dps and have completed the second one at 1427. the thing you are forgetting which you vaguely alluded too, was that you need to sometimes clip your own cooldowns. If you know a boss is about to go invincible PLAN FOR IT. refresh your enochain so you lose 5 seconds off of the total duration, however you do not lose it for the 30 second cooldown you are talking about. your refresh should be 30,25,20,15 the full 90 seconds. if you cannot for some reason deal with enochain potentially being down for 5-10 seconds and make up for the damage with a potion or a leylines while waiting for it to come back up, you should re look at how you do your mechanics. BLM is very finicky in the way it was meant to be played, and if played correctly does the same single target damage as any melee class, and more aoe damage than any other class (not burst aoe but long term aoe damage).