I have a new inkset for the MX860. It leaves the old inkset in the dust. PC226 inkset. They are more fade resistant as well.
Let me say this. Using the auto print functions with the new inks PC226 soon to be available, you will achieve better results than using odd inks and using Datacolor Spyder profiling hardware and software and using ICCs created from that.
In 2015 I will roll out new inksets that supersede the old ones. The new inksets for Epson pigment printers will be nothing similar to what IS offered prior. They are a matched hybrid inkset combining the best of what different mfrs have. Not a single one. Each is selected for color tracking, linearity and end print results and reliability. Reliability is an issue. (They are all made in the USA.....reason is that mfrs. in North America tend to maintain a better standard for quality that what comes from abroad.) Without profiles. Each mfr appears to have certain strengths in an inkset and also certain weaknesses. If you can harness the best of what each can offer you end up with a really good combination that a single supplier cannot offer. I think I have done that.
What makes your new MX860 more fade reistant?
A proper blend of ink will mimick the Canon OEM colors, so use of profile is not a must. Something it is good not to be tied to ICC, this way you use your multifunction printer copy function, and you get the colors right.
A long time ago I read some tests someone did, this person found out that some ink manufacturers had a particular weak color. This was confirmed manufacturers have poor fade resistance in some colors, OCP was ..., IS..., Inktec, and so on.
Now that you are making a smart move by choosing the I guess more fade resistant dyes of each manufacturer, you could end up getting a better product. This is something I wanted to make a time ago, but I don´t remember that post, and with time I forgot that matter, By focusing only on one provider gave you weakness. I hope you get rid of the problems I had with your CLI-221 set wich really frustrated me.
Maybe you are making the move of hybrid ink matching because of the rise in IS inks, I had seen that coming, you would look for other ink providers.