I'm in the UK so we're a little imperial here :) So 15ml tablespoon sounds about right!
I've recently started using "Isabel's Gluten Free Baking Fix". Seems to be working better than Xanthum Gum too. http://isabelsfreefrom.co.uk/products/gluten-free-baking-fix/ I believe the main ingredient in is tapioca starch.
You sure are a small Swede at 5'7" ;-)
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