Firestarter doesn't proc until your Fire I has finished traveling to the target meaning that, to use Firestarter as soon as it's up, you'd have to wait after casting Fire I to see if you're going to get a proc and then use it. This results in a very clunky rotation and also a net loss overall in DPS.
As for Thundercloud procs, you are basically using them as soon as they come up. You're simply using them as soon as you are done with whatever cast you are in the middle of or immediately if you literally just finished a cast. The only caveat is that Firestarter procs take priority over Thundercloud procs if both happen to be up at the same time.
Using Thunder II over Thunder III comes down to timing. Thunder II has a shorter duration that fits nicely with one loop through the rotation such that when you cast Blizzard III to start off a new loop through the rotation Thunder II should have just or will soon fall off of your target (this is obviously dependent on RNG with Firestarter procs throughout the rotation). More importantly, Thunder II's 0.5s less cast time over Thunder III allows you to follow your Blizzard III with Thunder II and have enough time to cast the subsequent Fire III for free as you'll get a tick of mana exactly at that moment from Umbral Ice III. In fact, I'd call this the primary reason to use Thunder II over III. Do note, however, you should always use Thunder III with Thundercloud procs as it's instant and more damage.


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