Digital BW, The Print

I have been using QTR toning for landscapes on HPR of 70 sepia and 30  warm.  
They give a richly toned brownish/sepia hue.  Now, I have tried  that 
combination on people portraits and find the prints very heavy and muddy  looking 
with no tonal separation.
 
So, I lowered the gamma adjustment and increased the ink limit to get  better 
tonal separation which solved the muddiness.  The problem is that  the tone 
changes, and instead of a rich brown/sepia, the tone leans toward  yellow.
 
Any suggestions on how to retain the brown/sepia with tonal separation  would 
be greatly appreciated.
 
Thanks,
 
Lisa 


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