Digital BW, The Print

This is my equipment
Scanner - Epson 2450 Photo
Printer - Epson Stylus Photo 1280
TWAIN - Silverfast Ai version 5 with NegaFix.  Have Calibrated with 
the color card from Silverfast and supremely satisfied with scan to 
screen to print in color. 
Paper - Epson Heavyweight Matte and have the ICC file to match for 
this paper and my printer.  

I started with some Black and White negatives.  The negatives showed 
Kodak TMX 5052.  I am a newbie here, as I am sure will show, but 
want to know the best steps to take to get a great B&W print in 
Duotone.  NegaFix doesn't show this particular film.   I know, 
somewhat, the Lab method and channel mixer monochrome method of 
obtaining a grayscale from color.  I then like the Pantone black and 
brown combo on Photoshop 6, which gives me really great results 
except for one problem.  I get a minute color bleed through on the 
print when starting with a B&W neg, which looks like a teal color, 
in areas that have a fairly high contrast, especially on a face. I 
hate to admit that I initially scanned using 48 to 24 bit color 
using the "other" settings on NegaFix. I then use either Lab or 
channel mixer monochrome to get to Duotone and still get exact same 
bleed.  Should one start using a B&W scan and then convert to RGB or 
what method is best?  Okay, maybe a stupid question.  Not used to 
doing B&W negatives but really want to correct this problem.  
Starting to learn how to use Duotone and want to graduate to Tri and 
Quad but want to go step by step.  Could I get different opinions in 
a step by step method on starting with a B&W neg or is this 
partially an equipment problem.  Had no problem at all with color 
negs to Duotone and printing with same Pantone combo.  Sorry this is 
so long.