How can I control the width of the dado for drawer divisions?  Running library 50.3. 

The division material is 0.77" in thickness and the resulting dado is 1.54" which in a perfect world is correct but a little too tight.  I have tried changing the dado width in the prompts but that results in the dados overlapping and the combined width does not change. I really don't want to create a separate material just for these divisions.  I think that in previous libraries that there was a global setting that would change this.

Anyone have any ideas?