So when Fina is out, Will Saki stay >75% HP all the time? If she does it might be worth to put a duration mod or use the duration gun on her.
It doesn't say here but this buff lasts 45s.
Or you might as well go full damage with 6 Blaze Volitions.
22% duration is only 10 more seconds.
55% max sanity gives you 2 more E casts, which extends Zephyr's effect (+154% skill dmg for 6s) for 12 seconds.