From my research, 4 rings, 1 pendant, 1 belt, 1 face acc, 1 eye acc, 1 earring and 1 shoulder with 20% each is 200%
100% base + 200% = 300% and the *2 from familiar nets you 600%, of course I'm not sure if it counts like this as I've not reached that stage yet.
Do you know how to add potential...