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Gentle on Nightmare Raids

Can someone PLEASE enlighten me on how to fight Gentle on Nightmare Raids, middle path, the last mini boss before Annihilus
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Obviously punishing his heavy is easier, but I imagine the chip damage is pretty insane, right? Instead of letting him hit into your block to bait the heavy, flip it around. Hit into his block a couple times, then hold your block. It's not perfect, but should be able to bait some heavies while significantly reducing the chip damage through your own block.
Block penetration is also lower at the start of the fight. Once you have your first charge, grit is going to refresh more freely, then it's a case of pushing him to an sp2 to punish as often as you can since as already mentioned it is easier.
Use your specials and striker to help you get from 1 bar to 2. Shortening combos when he is at 1 bar often helps because defenders often throw a special right after the full combo enders (second medium, fourth light).