Digital BW, The Print

When I run a nozzle check on my 2200, it seems the yellow ink is more and
more difficult to see (I do have 20/20), whereas the other colors are clear.
The nozzle check is OK, i.e., no broken lines, but I now have to use a loupe
to verify that with yellow.  Cleaning cycles don't help.  Also, I've noticed
that the print colors are "off" lately, running a bit to red.  B&W prints
are fine.  I'm using ImagePrint 6 and a monitor calibrated with Spyder Pro.


Is it possible for a print head to just print "weaker" and still show a good
nozzle check??  I can print a square of yellow and it looks OK.  Is it time
to get back to the eye doc?  Any thoughts appreciated!

Ken