I think I've set it up correctly, if I need to change something please tell me.

https://pastebin.com/mFU9x9yX

    "BlockWhen": {
      "giveDamage": {
        "enabled": true,
        "minCondition": 100.0,
        "minDamage": 1.0

Merged post

Drop minCondition to 95, and maybe increase minDamage to 5.