Correct format of item_randomopt_group.yml

[cook1e]

  - Id: 13 
    Group: Group_Robe
    Slots:
      - Slot: 1
        Options:
          - Option: RECOVER_HP_KILL_TARGET
            MinValue: 1
            MaxValue: 16
            Chance: 1000
          - Option: RECOVER_HP_KILL_TARGET
            MinValue: 20
            MaxValue: 80
            Chance: 1000
          - Option: VAR_MAXHPAMOUNT
            MinValue: 1
            MaxValue: 300
            Chance: 1000
          - Option: VAR_MAXSPAMOUNT
            MinValue: 10
            MaxValue: 150
            Chance: 1000
      - Slot: 2
        Options:
          - Option: VAR_MAXHPPERCENT
            MinValue: 1
            MaxValue: 5
            Chance: 1000
          - Option: VAR_MAXSPPERCENT
            MinValue: 1
            MaxValue: 5
            Chance: 1000
          - Option: VAR_PLUSAVOIDSUCCESSVALUE
            MinValue: 1
            MaxValue: 5
            Chance: 1000
      - Slot: 3
        Options:
          - Option: CLASS_DAMAGE_NORMAL_USER
            MinValue: 1
            MaxValue: 5
            Chance: 100
          - Option: CLASS_DAMAGE_BOSS_USER
            MinValue: 1
            MaxValue: 5
            Chance: 100
          - Option: VAR_STRAMOUNT
            MinValue: 1
            MaxValue: 3
            Chance: 100
          - Option: VAR_AGIAMOUNT
            MinValue: 1
            MaxValue: 3
            Chance: 100
          - Option: VAR_INTAMOUNT
            MinValue: 1
            MaxValue: 3
            Chance: 100
          - Option: VAR_DEXAMOUNT
            MinValue: 1
            MaxValue: 3
            Chance: 100
          - Option: VAR_LUKAMOUNT
            MinValue: 1
            MaxValue: 3
            Chance: 100
          - Option: VAR_VITAMOUNT
            MinValue: 1
            MaxValue: 3
            Chance: 100

Hello, what is the correct format? with this configuration i always get 3 bonus even if the chances are very low (1%) for example.

Can't figure how to make it to be with these chances (  First Slot 100% ) - ( Second Slot 40% ) - ( Third Slot 20% ).