Rouse is on a short cd so unless I know I need too save it for a boss mechanic were I need more burst or I plan on using my enkindle I spam rouse when its off cd.
spur has a more hefty cd so I usually save it incase I need more burst like titans heart or ifrits nails,but you can spam it with rouse if you know your not gonna need it before it comes off cd.
as for enkindle I save it for "must die phase"of any situation or just general aoe trash burst/boss melting,rule of thumb you should use enkindle right after you use spur and rouse for max damage.
as for miasma 2 I just use it for my trash aoe rotation along with shadow flare and dot+bane.