I was using an Epson 9900 and one of the channels stopped working. I remapped them and created curves for it. Shortly after more channels stopped working so I replaced the head. I have a set of the pro inks for all the channels. The only difference is I am switching the GO out and replacing it with photo black. I know I have to remap it, but what curves would I use for Pro and DN - the pro or the K4 or K5?