If it's missing nozzles, I would make them repair it (we did). There is something wrong with yours if you can't run the "invisible" markers and it keeps somewhat in line. We get banding on some materials but it's consistent on all modes and limited to those materials.
I'm not excluding it, but we rapid write off everything if its not paid for in cash. So traditionally if it's financed you are not deprectiating it all in one year. If you take the traditional approach like Gene described and depreciate over 5 years we have higher Net Profit.
We have averaged 38% for the last four years. We quickly weed out low-margin products or increase our prices. Now, that's not including all of our depeciation and etc. When you factor that we are below 20%.
It's the fabric, it pulls the ink. That's why it's bleeding in different directions on your prints.
Try cutting your density down to under 120%.
I'm not sure how to do it on the 315, you may have to do it in your RIP.
I don't know how you do it... I would go insane at 10% net profit, I would find it hard to run a business at that slim of a safety net.
But you have a great volume business that warrants 10% as you have consistency of growth.
I'm surprised no one mentioned this yet, but what is your ink density? After printing on phototex and other fabrics for year's, that inconsistent haloing is actually the ink bleeding into the fabric. It can be solved by reducing the ink density.
Being a fabric product the fibers can draw ink...