I don't understand the AoF decrease ATK scalling and increase DEF scalling.
Torture scales on MaxHP and Ravage scales on Special...

or are we talking about the stats? like raw ATK and raw DEF will be modifed? What's the point in changing the ATK?

Because for me, a skill (which deals for example ATK) and is described as scalling with another stat (DEF, HPMax or any other than ATK) for that specific skill, the ATK stat should not come into the equation of the damage dealt, otherwise the description is misleading. (I would be happy if someone could confirm that point).