Does everybody only use HD? I use one layer of normal foil all the time on shisha i know that doesn't burn that bad, or I just watch my temp a little more.
I do double layer sometimes with normal foil buts its usually with Hookah Hookah or something.
I use HD foil as well... It really just comes down to what I feel like each session.
I own and use these sometimes.... (from Hookah-shisha.com)
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They are no way Heavy Duty they feel extra thin, But again I use one layer of them all the time with no problems. It did take me one time of burning the shisha with the thin foil, to learn to heat manage it a little different.