Thanks for posting the image John, it's very helpful.
What paper are you printing on?
What curve are you printing with?
What resolution and speed are you selecting in the QTR print window?
Are you printing from Photoshop or QTR Print Tool?
If you're using Print Tool, what version?
What version QuadTone RIP are you using?
Please print the attached 21 step strip with the same paper, curve and print settings used to make the print above, and attach your print for me to see.
21 step strip.tif.zip (142 KB)