So, after all this time and much experimenting I finally discover the right way to do it. Behold
ISO 3103
* The pot must be white porcelain or glazed earthenware and have a partly serrated edge. It must have a lid that fits loosely inside the pot.
* If a large pot is used, it must hold a maximum of 310 ml (±8 ml) and must weigh 200g (±10g).
* If a small pot is used, it must hold a maximum of 150 ml (±4 ml) and must weigh 118g (±10g).
* 2 grams of tea (measured to ±2% accuracy) per 100ml boiling water is placed into the pot.
* Freshly boiled water is poured into the pot to within 4-6mm of the brim.
* The water must not be hard.
* Brewing time is six minutes.
* The brewed tea is then poured into a white porcelain or glazed earthenware bowl.
* If a large bowl is used, it must have a capacity of 380ml and weigh 200g (±20g)
* If a small bowl is used, it must have a capacity of 200ml and weigh 105g (±20g)
* If the test involves milk, then it can be added before or after pouring the infused tea.
* Milk added after the pouring of tea is best tasted when the liquid is between 65 - 80°C.
* 5ml of milk for the large bowl, or 2.5ml for the small bowl, is used.