Urh the only debuffs for Force are parry and attack rating, I think he wants to know if all the debuffs from 30 - 100 work.
Plus thats pretty good, it weakens the rate of which your enemy does damage to you to the lower end of the Atk spectrum (e.g. 100 - 150, you more likely hit the lower end) and also lowers the enemy's defense spectrum (e.g. 100 - 150, the enemy is only more likely to protect themself from damage on the lower end)
As for that question I'd like to know as well!