I rebuilt my SB (95 lvl) into the cold PB variant and made a quick setup with gear (only one mithical item - offhand) to play around. The devotion setup from Chthon’s calc was used.
The DPS for PB with transmuter is ~17000, PB damage statistic can be found here. The DPS for PB without transmuter is ~ 11000, CD is 1.8 seconds and PB damage statistic can be found here. Not too long to wait for PB to get off CD, but need further testing to optimize build setup.
Whoops didn’t notice it till now
That was just theorycrafted by me. I use PB as a nuke on Acid builds but outside that I’ve got zero experience.
I won’t recommend using Amarastan Bladethrower for the Pierce>Acid conversion as if you pick Frenetic Throw all that Pierce will be converted to Vitality. For non Frenetic Throw I can’t speak w/o testing
Build updated
-Added multiple variants of the core setup
-Performance increased by adding a nuke
-Managed to retain QoL by not picking Lethal Assault.
Have fun
I’m confused about the vitality conversion of Frenetic Throw with the cold conversion of Speaker of the Dead. Like, does the former come first or does the second come first?
It seems to be the latter but then how can you convert the pierce in PB when it’s already converted to vitality through Frenetic Throw?
pierce is converted to cold 100% on phantasmal blades, when you pick frenetic throw since all pierce is already converted to clod the 100% pierce to vitality is ignored.
Then heartseekers vitality damage is converted to cold depending on how much vitality to cold you have.
What if you pick Frenetic Throw first and then equip Speaker of the Dead? Will Speaker of the Dead modifier still go first? I need to test this.
Chthon, could you share with us PB damage statistic for Acid Based PB Witch Hunter build with picked Frenetic Throw? Would be interesting to see PB total damage and PB damage per damage type.
P.S: In vanilla game I was not able to get good acid damage boost for PB with Frenetic Throw.
Doesn’t matter. The Skill mod would still take precedence
As long as you have Speaker equipped, skill mod would take precedence
As I said before I only posted a theorycrafted link to the concept extension section
I can make one in an hour or two by shifting gear from my other builds but right now I am sticking to a schedule
Schedule for now-
>Aether PRM
>Aether WK Might
>Cold Breaker (s) update (can mean one build or multiple)
> ??? (New Build(s), more than 1 possible)
>Possible update to Blood Pox build and/or Doom Bolt Pyromancer
>Retaliation Build update
>Pierce Blademaster Update
>Physical FW update
>??? (New Build)
>Acid Ranged update
I will post other stuff after this.
EDIT:
Added Cold Devastation setup
I see. You have really tight schedule. 
P.S: If I have a time I will try to test your theorycrafted setup for Witch Hunter PB.
So skill mods come before the skill transmuters in the conversion order? Nice, good to know.
Same reason why M. Ulzaad’s Channeler, M. Deathbound Amethyst and M. Speaker of the Dead don’t total 100% Vitality to Cold, even with good rolls - because M. Deathbound Amethyst’s conversion takes place first, then the remaining damage is considered in full for the other items as 100%. They’re at completely different stages as you now know with skill modifiers on gear going first.
In the end, you only get around 77.5% Vitality to Cold conversion (25% + (75% * (45% + 25%)) to Phantasmal Blades.
I did it! Below is PB damage statistic for Witch Hunter build with Frenetic Throw. The setup is not final and optimized - just to make quick test and overview.
Grim tools calc: https://www.grimtools.com/calc/p25wOamZ
PB damage statistic (under permanent buffs and Blood of Dreeg):
P.S: The PB acid damage is quite good compared to what I got in vanilla game (~8.5 times higher damage).
Thanks for testing it
Modified the setup in the main post
EDIT
Going to post mine soon
You are welcome. 
Will be interesting to see your final variant.
P.S: BTW, you can invest 1 skill point into Breath of Belgothian to enable dual wield melee weapons (I could miss something, but looks like your current gear setup does not support it), reduce Pneumatic Burst CD and boost health regeneration.
Played around with acid PB Witch Hunter setup and ended with this one focused on defense:
grim tools calc: https://www.grimtools.com/calc/a2dwD11N
P.S: Maybe I will change gear setup once get access to augments from new fractions and/or get good MI pants/rings. Will also test skills setup to optimize it.
P.S.S: The only concern I have now is energy issue when actively using PB.
Don’t know how I missed it but yeah B.O.B needs a point to enable dual-wield
Setup looks cool btw
That’s rare used feature, not many pay attention on it)
Thanks, I tried my best. 
Umm, what? (what feature?)
Enabling dual wield on Breath of Belgothian.
Pretty sure it’s rather common
I just kinda forgot about it but B.O.B based DW Caster playstyle has existed since vanilla
