Do you have impact damage enabled on the DM? If so you should setup your DM without impact damage and then in your punchBP use an apply damage node and set it to the damage level to bash through the DM.
Do you have impact damage enabled on the DM? If so you should setup your DM without impact damage and then in your punchBP use an apply damage node and set it to the damage level to bash through the DM.