He cover's his body with haki first to harden his skin. This multiplies the elasticity of his rubber. If you've ever pumped up a tire before, it gets insanely hard. This is essentially what Luffy is doing.
This means he's containing all the energy by keeping his skin tense. Given the strength...
Pre-Wano Luffy is able to emit and control enough armament haki to create the monstrosity we call Boundman.
Nothing Zoro had shown before Wano implied he could do better than that.
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