Digital BW, The Print

I have recently purchased some VT Blax inks (rebranded MIS, as they 
are part of the same company) and have run into some problems; they 
might be me expecting too much from the inkset but I will ask anyway.

It seems that some prints when I print them out are missing some 
tones, and this is causing almost polarisation of the image.  I have 
printed them out on an 1160 with a quad-tone VT Blax set and there 
doesn't seem to be a problem.

This is the frustrating part; when I do a nozzle check it is fairly 
good with only a couple of lines missing (1mm on maybe one of the six 
patterns), when I do the purge it is fine when I print out the images 
they are not correct.  I regularly clean with IPA and water cleaning 
cartridges. 

I have taken the printer back to Permajet to see if they can find 
fault and funnly old thing it worked fine!

Is there a problem with the file? I have posted a couple of 300dpi  
images at my site and would appreciate it if anyone with a 1270 with 
MIS/VT Blax could try printing them out and see if they cause any 
problems on their set up.

The images canbe found at 

http://dialspace.dial.pipex.com/town/green/aoot87/imagesoflife/avebury
 stones-small copy.jpg

http://dialspace.dial.pipex.com/town/green/aoot87/imagesoflife/curves 
in avon copy.jpg

http://dialspace.dial.pipex.com/town/green/aoot87/imagesoflife/face 
sculpture.jpg

Many Thanks for any feedback/help I might get.

Gareth

www.imagesoflife.co.uk