Digital BW, The Print

I just started using the Epson 2400 for B&W prints.  Wow!

Has anyone noticed that there is a bit of cyan even with the Advance B&W 
setting, using Matte Black etc?

Anyone understand the differences in the media types and what will give the 
best results with rich blacks?

I am using Legion Photo White Matte 10mil and getting really good results. 
Any suggestions for other Matte media and a source?

BTW: The Cannon 20D B&W settings with the Epson 2400 are really a great 
combination.  I have been a Nikon fan for over 35 years and the B&W 
dedicated mode with Y, O, R "filters" are very interesting.