We just brewed the Shakemantle Ginger from either Clone Brews or Beer Captured, I don't remember which. I think it was Beer Captured.
That recipe called for an once and a half at the boil and a half ounce in the secondary.
I just got to try it, I thought it would be far too mild. As it turns out, it has a pleasant ginger aroma and a nice refreshing ginger taste without any ginger "bite". If you were looking for stronger ginger flavor, in terms of "bite" I would go double or triple the recipe. I would try with less first, it would be easy to go overboard with ginger.
I will say that the Shakemantle Ginger was plenty of ginger for me. A very simple beer that is nicely refreshing and will go good with ginger based Asian dishes.
Gedvondur