Enable/Disable Auto-optimize

iirc, if you are expanding the list of Optimum-incompatible items, you need to make sure that no single category (e.g. Helmets) has more than 8 such items, or be ready to expand an earlier loop.

from my post in the linked thread: "the way the game is written, it relies on fallback FFs in the generated Item list to use should Optimum run out of options."  this list of FFs is just a token 9 entries (which matches the # of rows on an equip screen).  however, if your character-compatible list has a bunch of Optimum-incompatible items in it, it overflows the backup list.  if the game has success when scanning for an Optimum candidate, you're alright, but if not, the game will load from uninitialized gibberish for its fallback.

see C3/9C2A.