Digital BW, The Print

Hi folks,

I got a problem -- one image that I want to print is quite compressed. 
You could see it here: 
http://www.flickr.com/photos/santonov/152394862/. When I sent it to 
2200 with UT7 ink set through QTR, I see some tones are unpleasantly 
blocked. I have used Entrada curves when printing on Kayenta paper. My 
previous experience with that papers and QTR were quite positive -- I 
did get nice prints on Entrada and nive proofs on Kayenta. I suspect 
that it is my picture that causes compression. Could any one share 
some knowlegde about preprocessing the images that tend to be produce 
blocked printouts, if there is any possibility?

Thanks,
Sergei