So with my bit of research, I could find an answer that seems to be the correct one.
Basically the build I made is still viable, but with the recalculations from the new patch, it seems that using Keen Blunt Weapon isn’t as necessary as it was before (for me in the RU ver).
To give an idea of the calculations, now :
We can compare the Adrenaline 2 and Empress Grace 1 to this new builds :
Adrenaline 3 + Empress Grace 3 = 14.9% more dps than before with the Adre 2 and EG 1.
Adrenaline 2 + Empress Grace 1 + Cursed Doll 3 = 15.4% more dps.
Adrenaline 2 + Empress Grace 1 + Keen Blunt Weapon 3 = 13% more dps.
So overall, you will gain just by changing KBW with Cursed doll a gain of 2.4%. And of course if you add it with Hit Master at 3, the flat gain will be even higher, hence better than KBW now.
Like I said it’s still viable but you"ll need:
333321 > Grudge/KBW/Barricade/Hit Master/Adrenaline/Empress Grace.
This build is weaker but more comfortable to play with as in you are counting on your crit to build damage and makes you safer in general battles. You can also rely more on your pots (and use Major HP potions instead).
But then, with the new patch, the best build seems to be :
333331 > Grudge/Cursed Doll/Barricade/Hit Master/Adrenaline/Empress Grace.
333321 > Grudge/Cursed Doll/Barricade/Hit Master/Adrenaline/Empress Grace (less expensive).
This build is more expensive and will require you to be perfect in the execution of the class.
I hope it clarifies why there are using this build. Although mine is still viable at our current state of the game if the Arcana is coming before the Ancient gear is coming.
But like you saw, it’s still viable to play with KBW, you’ll have a bit less damage but safer overall.