Magic Accuracy problem

[Byrth]

In order to follow this up, I went out and tested this myself for a while this morning with Full Break. Despite the NA description, our community sites have its duration structure being:
100%: 1.00, 180 sec. duration
200%: 1.00, 240 sec. duration
300%: 1.00, 300 sec. duration

and they say that it can have a 50% resist duration (90 seconds/120 seconds/150 seconds respectively). I did Full Break half a dozen times against rabbits in Abyssea - La Theine (Easy Prey, approximately level 75) waiting 10 minutes every time and the only debuff I could get to land somewhat reliably was Attack Down, which landed for half duration. I got Evasion Down to land once for the full duration, but never saw Defense or Accuracy down.

So then I tried Armor Break (Defense Down). It fully resisted three times.

I used Weapon Break and it landed once for duration.

I switched weapons from Great Axe to Dagger and used Wasp Sting and Exenterator. Both landed for the expected durations, even though Exenterator gives an Accuracy Down debuff like the one from Full Break that doesn't land.

Then I switched to Great Sword and used Herculean Slash and Shockwave. Shockwave (Sleep) was totally resisted, but Herculean Slash landed for the proper duration.

Switching to Staff, Shell Crusher was totally resisted.

Going to Club, Flash Nova and Brainshaker landed fine, but Skullbreaker was entirely resisted.