Digital BW, The Print

I just wanted to find out if anyone out there is experiencing 
banding while using QTR.  I first tried QTR using a 2100 and always 
had banding.  This would be most evident in highlights or on skin 
tones.  I upgraded to a 4000 and downloaded the latest QTR version 
but still have the same problem.  QTR always has banding for me no 
matter what profiles I try.  With ImagePrint I am normally banding 
free but there are the occassional images that band.  With the Epson 
driver, I never have banding.  

I am wondering if the cause of this has got to do with the way the 
curves/profiles are written and how these RIPS lay ink down on 
paper.  I was also thinking that these RIPS probably use plenty of 
Black ink and that if there was a slight problem with a black nozzle 
banding would show up.  However, my nozzle checks are perfect and I 
have no banding when printing BO on matte and glossy papers.  

I like the flexibility of QTR but it always bands for me.  Hope some 
experts out there can comment.  Thank you in advance.

JM