A) You're using Carafa Special (i.e., the dehusked variety) and not regular Carafa, right?
B) Briess claims that Midnight Wheat is the smoothest of the dehusked malts for adding color, and I tend to agree in my experience. This is all I use for color adjustment now. In something like a lager you will probably still find some roast. But that's because you're the brewer, you know it's there, and you're looking for it.