Digital BW, The Print

I am sorry for another post about clogging with a 1280, but I seem to 
be having a different kind of problem and the Yahoo archive search is 
no help.

I am experiencing clogs in multiple heads that began after installing 
a new UT2 cart.  I have tried most of the usual solutions; returning 
to OEM ink, letting the printer rest overnight, various windex 
tricks, etc.  What is new to me is that I can occasionally get a good 
nozzle check.  I then try to print a purge pattern and I find that I 
get lots of banding.  I then print another nozzle check and find I am 
back where I started and cleanings don't help.

Any suggetsions?

Thanks for the help.

Peter