If you delete the QTR profile in the Profile folder for the printer in question, and then delete the .suad file for that printer in /Library/Printers/qtr/quadtone, the profile should not be available.
Could be that you have a couple of versions of QTR installed on your hard drive, or perhaps you have not deleted the default setting in your printing application. If using Print Tool you will need to close it and start up again after installing a new printer or profiles.