Digital BW, The Print

Hey all.  I've been testing a few papers on my 1520 with 
Piezography BW inks and using the Piezo software.  I printed out 
a file that looked great on the EAM that I'm using as a proofing 
paper.  But, when I printed the same file on Somerset Photo 
Enhanced the darker greys and blacks printed considerably 
darker than the EAM even when using the profiles in the Piezo 
software.  Is this a normall occurence?  Will I always have to test 
my output on the final paper?  I thought that the purpose of 
having profiles was to alleviate this problem.  

On another note....  I bought some of the Somerset Photo 
Enhanced paper from InkjetMall.com and wasn't sure which 
profile is the correct one in the Piezo software since there are 4 
options for Somerset papers.  Is it Enhanced, Photo Enhanced, 
Photo enhanced Velvet, Photo enhanced textured?  Also, which 
side is the paper coated on if not both?  

Thanks in advance for your responses.  I've always found this 
group to be helpful in answering questions.

Andy