| The loss of tension associated with downtuning makes your strings looser, and the clank comes with that (same force of attack + lower tension = more string movement). The thicker gauge string advice is because thicker strings generally have more tension than lighter gauges, which makes it a bit easier to have a consistent attack; personally I'd recommend heavy strings as well, because IME not only do they help with the tension problem but also present a stronger fundamental, which is great for any kind of "heavy" music.
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Bassoonists can be bass players too, not just failed guitarists.
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