Tunings don't have a level of "heaviness". This isn't a question with a meaningful answer. Lots of people find tuning down makes it sound heavier, though, so if your amp can keep up I guess the lower the pitch the better? But in practice, not really.
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3d9310rd is far more upset than i 

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I'm a moron tho apparently and everyone should listen to you oh wise pretentious one
As much as he annoys me, this guy has the answer.

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