Quote Originally Posted by AlterX View Post
Say If I cap Dbl 15%, Tpl 10% wth 5 acc on 1 kamihime, does the effect bonus of tiara dbl/tpl +15% still stacks? so become +30%dbl/+25%Tpl?
Yes. Plus 8%/3% base, to a total of 38%/28% = 66% combo rate. Which means guaranteed combo with Yorimitsu's Combo buff, for example.

The problem is such a thing being basically unreachable for one Hime, much less all the Hime.