I often brew my tea a little stronger than I want it, and then dilute it with water until it is perfect.
I like this, as it speeds up the cooling process (I like the tea warm not hot), and makes it easy to create the perfect tea strenght without excessive experimentation.
By stronger, I mean that I use more leaf. I still try to brew for the optimal amount of time for each tea, which I have to experiment to determine.
Anyone else do this?