Digital BW, The Print

There are a couple things to try:

First: set the secondary color readout in the Photoshop info panel to 32-it L*a*b* and use those readings for the linearization. 

Better yet would be to use the same readouts and use them in my free correction curve sheet to rough in the gray curve. You could use the 10% steps and make up the intermediate 5% steps you can't read from the scanner and just settle them from the resulting gray curve string before installing the profile. 

The next best option would be to get the deluxe version of my QuadToneProfiler tools that allow for smoothing the shard edges from the default qtr created curves and relinearizing with more control than you can do with other systems out there. 

Hope that helps, 
Richard Boutwell

http://www.richardboutwell.com/
http://www.bwmastery.com/