Tormented Demon KPH?

So I was killing Tormented Demons and thought to myself "I'm tired of waiting for them to spawn!" so I stopped luring and instead rambo'd them for a delicious 60 minutes... and only improved my KPH by 30%. If I killed 100 an hour normally that'd be awesome...! But I only manage 70-75 per hour, so this improvement means my KPH is just 90. I've heard of some of the awesome Tormented Demon slayers getting upwards of 120.

My gear is void, styles are magic (Chaotic staff) and range (Royal crossbow). I use holy water to knock down their shields, then immediately use my abilities strategically:

I first use Wild Magic, immediately queue Wrack, so I hit 3 times (except when Wild Magic first hits over 3100; that's annoying, to say the least). Then I use Piercing Shot, queue Bombardment, then queue Binding Shot. Then I use asphyxiate and immediately queue Wrack. Then I switch back to range and use Piercing Shot followed by Snapshot. I then queue demon death animation.

Depending on other factors, this could be slower, but regardless, I don't take more than 30 seconds to kill a demon, hence I'd think 100-110 KPH would be obtainable this way.

Would level 90 gear make all that much of a difference? If not, does anyone have a recording of the way in which they lure or otherwise slay Tormented Demons efficiently? I use the southern spot, if that helps any (the best one featured in the Tip.it guide, I think).