I use a butane burner on mine and more of a course grind - also 20g and 240ml of water - I infused for 30sec or thereabouts stirring gently as I go, and I keep the flame on a low heat and chop it and or remove the burner at the 30sec mark I had the privilege of having one on one personal tuition with the Japanese syphon champion a couple of years ago and she recommended a coarse 'like sesame seeds' grind and a darker (than usual filter) roast - but I think this says more about the Japanese market than Australian conditions Also, because I'm trying to capture the oils with a syphon coffee, I like to age my beans so that they're at least ten days post roast, for syphon, so that the oils are starting to come to the surface of the bean Cheers, ACg