Kuki must be lvl 90 because the difference between dmg lvl 70/80 and lvl 90 can be 20℅ more. use EM weapons, if you use the gilded dream artifact then the dendro character uses deedwond so that the dendri resistance goes down, because hyperbloom dmg includes dendro dmg.
my kuki stats/teams are same with yours, but on spiral i only reach 12-20k hyperbloom dmg, how could it be
Kuki must be lvl 90 because the difference between dmg lvl 70/80 and lvl 90 can be 20℅ more. use EM weapons, if you use the gilded dream artifact then the dendro character uses deedwond so that the dendri resistance goes down, because hyperbloom dmg includes dendro dmg.
The point is to raise em as high as possible.