Digital BW, The Print

When converting a B&W image to a duotone in Photoshop, I find that 
the resulting image/print is always darker with less shadow 
detail than the original B&W. 
I haven't seen this mentioned in prior posts. My workflow is 
pretty straight forward B&W mode> RGB mode> Duotone. Then I typically 
have to Edit>Apply>Screen to lighten the print back to its 
original luminosity. Is there a better way? Thanks.