So. Not knowing how I pulled this off is making me feel like an idiot.
I decided to be that noob that plays the game using only Guardian Corps, Knight of Etro, and SOLDIER 1st Class (except when forced to do otherwise for specific quests, of course).
On each garb, I equipped an Attack and some Guard ability.
But I'm not here to ask how to not be stupid with customizing abilities.
What's eating at me is... with the Knight of Etro garb, I am somehow perfect guarding against light attacks.
No. It's not perfect timing on the Guard. I would literally hold the button down, and it would perfect guard against all light attacks. And it only happens with the Knight of Etro garb.
So I checked the Auto-Abilities, and all I have on it are two Strength Abilities--one of which increases by percentage, the other by a fixed amount--another with 100% resistance to Daze (before I had one that resisted Defaith and forgot it was there afterwards until recenty--no change in the guarding thing), and another boosts maximum HP.
The only thing I can think of is that the Strength boosters have something to do with it, but I doubt it.
I could be completely wrong about that, though. I did something, but I don't know what it is. DX