Digital BW, The Print

Hello, I'm new here.  My name is Katie.
I chose to explore digital negatives as my independent study in
undergrad school.  None of my professors have used the process, so as
you might imagine, I'm going to have a million questions!

I'm following Dan Burkholder's book for printing with inkjet onto
transparency film, contact printing onto silver gelatin (fiber based).
 It sounded like the 1200 bitmap dither method worked best for this,
so I formatted my image using that process.  But then I got confused
when it came time to either colorize or make a color table (using
orange ink instead of black).  

I used the color table method by switching back over to RGB mode. 
Then I could not get my image to print because the computer would just
freeze up.  I contact a friend who informed me that 1200 dpi is way
too much for any printer to handle.  Then I noticed the page where
Burkholder says that 480 is a good resolution for silver printing.  So
I converted my image back to 480dpi, and had no trouble printing then.

Here's my results from the darkroom (although horrible scans):

Straight Print
http://www.katiegregory.com/straightprintsm.jpg

With a #5 Filter
http://www.katiegregory.com/5filtersm.jpg

They look awfully grainy to me.  Which leads me to ask; did I follow
those steps right?  I get lost in that book easily.  Any other
suggestions are greatly appreciated!