You need something with a much lower Rds On. Even at 0.02 ohm, which is not much different than what you got, you'll need some pretty beefy heat sinking. Here's one from digikey. The part number is IRLB8743PBF. Rds ON is 0.0032 ohm, which is almost a magnitude smaller than what you have now. The one I listed runs at pretty much ambient temperature with MK2 heatbed, no heat sink. But then you can find ones with even lower Rds ON.
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