Every time I create a new configuration in a part file, a new "Carbon Steel" appearance is also added. & I want it to stop doing that.

My default part template is configured like this:

-Default Material = "Carbon Steel"

(custom material, copied & renamed from "plain carbon steel" w/ appearance changed to "matte steel")

-Default Appearance = "Matte Steel"

(from built in appearances catalog)

-In the appearances Tab, I have nothing defined, so the model reverts to the default appearance.

-I have a single display state and it is not linked to configurations.

Adding a new configuration adds a new "Carbon Steel" appearance that gets applied to the whole part & I'd like to eliminate the need to manually remove the unwanted appearance each and every time I create a new configuration (which, my friends, is often). 

In other, simpler terms.  I only ever want to see the Matte Steel appearance on any part, at any time, unless I manually specify something different.

Can anyone help me work around this persistent creation of the "Carbon Steel" appearance every time I add a new configuration?

Thanks!