I am confused regarding thunder 1, 2, and 3.

Largely because I am a summoner and use to applying both bio 1 and 2, but I am getting the impression that black mages don't actually apply all thunders.

So what is the proper way to play?

-ignore thunder
-apply tunder 2
-use thunder 3 when thunderscloud procs?

Or do you just apply thunder 3, again when clou procs, and ignore thunders 1 and 2?

thanks!