The potential unlock of black flash is stackable so Yuki should be using 1200% of his potential.
Which means Hanami should be long dead.
Do you even watch JJK
Ch 24 Chapter 24
Jujutsu Kaisen: Becoming the strongest as Yuji Itadori
"That bastard really gutted me for real," Ace joked, trying to humour himself as he felt the phantom pain. After all, it's not every day you get a hole punched in your stomach.