[Snake]

Or instead of it being a cure, make it halve the LV of those effects (Such as Rampaging, Buster Cannon and etc.) at Rank 3?

It 'can' stay like this, but only if Armor starts mattering in general, and I see this change as an opportunity for us to give Armor and Magic Armor some love. So why not us set a Balance Fu for the sake of buffing Heavy Armor and Light Armor a little bit?