That a good looking recipe, but it is a sweet tripel. If that is what you want, go for it. If not, add some more bittering hops. It looks like you'll have some good, complex hop flavor.
You have some wiggle room with your color, so you might want to add a touch of CaraVienne for malt complexity, but that won't help you on the sweetness front. The aromatic malt probably gives you what you need, and I'm just thinking out lous, anyhow.
Tasty beer! If it truly comes in at only 43 calories per pint, you might just be a millionaire.