use evis if the following -> rupture is about to drop off
use recoup if -> using somethign else would result in you not being able to get back to 5 points and refresh recoup without it droping off
use snd -> when you have <3 secs left any combo ammount
-> if none of the above evis.
as your haste level goes up your number of evis's goes up as you can get more in before having to refresh something else.
IF you are going to have to drop something it would preferably be recup.
Now if the toss up is between rupture and snd it depends if the rupture is buffed from Mater of Sublety. Try to keep that initial rupture up for as long as possible.
Vanish helps in this case as well.