I've a build for you guys to consider. Maybe meme, maybe not?
I considered what skill would work best for tornado and I attempted to find one that can be a spell as well as converts from physical damage to ideally scale both skills on a 6 link - that leaves with two options; Ethereal Knives and Unearth. Unearth actually deals more damage/second and allows you to utilize corpses for consumption shenanigans and use necromancer which comes with a juicy 40% skill effect duration, creating a larger window to pump projectiles into the Tornado and have the tornado chase time last longer. Since unearth auto pierces, you can use both seamlessly on a single target while the tornado fixes the coverage issues unearth suffers from. Arcanist brands are your single target oomph to get up to 200% cast speed which scales a skill like Unearth and its 0.3 base cast time into overdrive.

https://pastebin.com/K9M5YfQe
Update 1(swapped gloves, added a set of cluster jewels and 3 prop jewels):
https://pastebin.com/sCWNMu6n
Update 2: Tornado 6 link is underwhelming and the speed is too slow to consider it for clearing, so to not waste the Unearth meme, I added Kitava's Teachings and arcanist Brand VD instead:
https://pastebin.com/6xHjcsxi
Update 3: Changed up pathing, swapped out anoints and gloves, toned down the cast speed as I'm not getting that until a good few seconds. For Qol, it is nice to have the brands come out quick and once those ramp up your single target skyrockets.
https://pastebin.com/fJLqdghq

Here's the pob, id appreciate your feedback on this idea.