The barber is giving 28%x more damage vs single target, and potentially a lot more vs AoE as multiple explosions can hit the same target. I recommend checking out the full build guide I have a link in the description and pinned here in the comments. The full guide does a more in depth explanation of a lot of the damage of the build.
Gunna see what the patch looks like tomorrow, likely still going to farm these 100s up to level 100 in the meanwhile and can try to keep sharing some of them.