Setting Color Model has no effect

[dangoodmanx]

I tried setting Color Model in the settings for the BullZip PDF printer to CMYK, and then checked the resulting document color space in Adobe Acrobat Pro only to find the color space still set to DeviceRGB. I also tried setting the Color Model to Grayscale with the same result. I just upgraded to the Pro version because this feature wasn't working in the Community version, only to find it also does not seem to work in Pro. Am I missing something? is there another step to get the Color Model setting to work? Thanks.