Hi Mike,
If you have the Baader Modded camera your CWB should give nice results with CWB. Not so if you replaced the canon filter with a clear glass one.
For your CWB just use a greycard and take a image of it under the lighting you shall be photographing under with AWB than load that image as your CWB in your menu.
If you don`t have a greycard just take a picture of a piece of white paper and slightly underexpose it...
here is a pic with CWB and AWB with my Baader modded 20D.
Tried to find something with a few different tones and shades.
Hope that helps
cheers Gary