1.5 tsp for 300mL water @95C, steeped 4 minutes 30 seconds.
I’m experimenting with slightly cooler water for black tea. I am finding that Assams and Ceylons seem better with the full rolling boil at 100C. So does Scottish Blend, a CTC that seems heavy on the Kenyan tea. The 95C water doesn’t make the tea and sweeter, as happens with some China black, just duller. Live and learn.