Ascendancy and Gearing for Cold Based Sweep Theory Build

I'd like to put together a Cold Conversion Sweep character. Seen a few Sweep videos online (FastAF & Mathil) but want to do the gearing my own way.

1. putting Sweep in a pseudo 7/8 link helm similar to this one in the picture
2. 6 link totem setup in weapon (voidforge or crafted rare using Fleshripper/ Banishing Blade/ Exquisite Blade)
3. double curse setup in chest (Explode or Carcass Jack depending on ascendancy) or just get curses on rings and use this 6L for another setup

What would be the ideal ascendancy to go with? Trying to decide between Assassin, Slayer, Berserker, or Raider.

Definitely looking for great AOE either through ascendancy or gear, and the ability to create chain explosions on packs similar to how BV/ CoC Nova builds do it as I plan to use this for 100% delirium testing. Bossing wise I believe damage is already there because of the high base damage on the Sweep skill but I could be wrong.

Possible Helmet for SweepUpdate:

I spent all day on a PoB for this using the Raider ascendancy. Would love to get some feedback on it as it's the first build I've ever created myself.

Cold Conversion Sweep: https://pastebin.com/G1PjGzdZ