oh didn't know you can stack thunder3 / thunder 2 / thunder 1 all together
/nod but after you casted thunder 1, thunder 3 almost wear ^^;
then can't really rely on it... but 0.75 times per mob for that huge boost is kinda fun...

but I don't understand this part
-Thunder I: 190+160 Potency over 12s/4 ticks
-Thunder II: 250+200 Potency over 15s/5 ticks
-Thunder III: 300+240 Potency over 18s/6 ticks
/muttering on AGAIN
so the thundercloud buff add DoT total amount to initial damage and later still do DoT as original? oh it's clear now.. XD

let's see in practical way, use battle experience at dungeon as example... at lv cap, pt usually need to face 3-4 links at same time. on the 3 mobs group, my cnj/whm can sleep 2 mobs (30 seconds sleep) through 1 cure and cleric stance and join the nuke. In the end of mob #2, mob #3 will be about to wake up. That means in best situation, each mob will last about 15 seconds. So... I guess this thunder thing wasn't that worth it than fire fire fire?
in the dungeon boss fight, I think put in thunders is kinda worth it. The fight need to last longer than 3.5 + 3 + 2.5 + 12.5 = 21.5 seconds to make it worth a while in large amount of case?

ya I think Sylkis's The House results are the best for dungeon normal mobs.
for boss, mix in thunders to get 107 dps... I think pld tank can hold it.

/muttering off

I'm not sure how long it usually last when solo situation tho. but I think The House Sequence is good in any case