Archer/Hunter Help Stratiformis build help

So this is probably going to sound ridiculous, but though I am aware that sharp reigns supreme, the introduction of feedback loop into bolt's kit has made me more interested in playing it that ever. I already have what I think is a pretty good build (Gale's Force) on pre-Fruma boltslinger, but there I think it's time I upgraded to a mythic. Therefore I intend to use Sratiformis, as it looks like it fits my playstyle and the masterwork varient was recently released.

The stats I'm looking for
1st and 4th spell cost
Air damage % (ideal) and raw
mana regen and mana steal (probably some mixed mana overall)
Super slow to slow attack speed

This build is entirely focused on arrow storm, transcience looks like enough to ignore arrow bomb. The cycle would likely be 4-1-1, with a melee mixed in somewhere.
I was probably going to go for this tree, though homing shots is good for flint arrows and mana steal, bosses are big enough that I can reliably land 2-3 arrows and I don't want to waste the ap just for fodder mobs.

My main struggles with buildmaking is finding items that provide mana steal (opposed to the original full reliance on mana regen) and enough SP with an ETWA, or if necessary an EWA or TWA build to reach the agi reqs on Stratisformis, as I've been struggling to reach that point on my own.

Any help is greatly appreciated!