Re: Question about burning shisha
What kind of coal are you using, and how much? How are you poking the foil? Maybe not enough holes? Most of the time you don't need the cover, and using it insulates it a bit, keeping heat in. Keep in too much heat, and it'll start burning.
It all comes down to heat management - you can do it with pretty much any coal, as long as you use the right amount for the hole pattern in the foil. Once you find a setup that works, stick with it.