It's hard to say. When I first read the post, the bases that came to mind were possibly tonka bean(powdery,vanillic) or orris(powdery, iris root). One of Joop Jump's reveiws says it has a noticable tonka base. The only way to ferret out the offending note is to list the ones that choke you, find their pyramids, and see if they all have a common note. Or it may be the whole psychological niggle of smelling powder from any powdery base. The brain can really trip you up.