SR Assault gives you 3% base. SSR Assault gives you 6% base.
Each weapon skill upgrade gives you 0.5%, and as slvl20 is the max, that means 10% per weapon. So 13% per SR and 16% per Assault.
This means that the "cap" is 160%, but realistically, you can reach 100-130% depending on how many HP weapons you'll bring. This % is given only to Hime of the same element as those weapons. However, the base stats are given to all Hime.
You'll want to reach at least 80% Assault from your weapon grid. That's roughly the breaking point where you'll stop caring about Character Attack Eidolons and only care about Elemental Attack Eidolons.No, only primary ones are visible to other people.