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Dave, I would really like to come over and try to help you out, if only to gain some experience of the Presstek DI and your problems. There would be no charge. Let me know if you're interested. I can come to you any day next week.

Not a good start to be hampered by your ink set. If your trapping colours are close to standard I think it would be worth calibrating curves to ISO and evaluating the results against a Fogra standard proof before looking at .icc profiling.

How did they measure up? Still outside of 5 deltaE on cyan and magenta?

Maybe try taking single colour pulls and measure them with the spectro to ensure you aren't getting any back trap contamination from the unit before?

Dave you are correct, the curves should have no effect on solids (but check with a high power magnifier to ensure there is no dot drop-out) Which Toyo set are you using? What sequence are the inks running in? Is there any dirtying of the inks in the duct that could skew the hue of the cyan and...

What does the spectro give you as the closest expected deltaE for the primary colours? (without any colour management turned on)

Hi Dave, I was a CD102 minder in charge of printing to ISO12647-2 standard. I also work freelance for a colour management company. I hope you can get enough of a steer from this forum but if not I could pop and see you for a bit of fun!

Sounds like encompus has hit the nail on the head for you. If you still have problems I might be able to come to you and help out. I was recently made redundant, live in Bucks and have some time on my hands!

Are you running correct ink sequence, K/C/M/Y?

Printing the yellow down first will always affect reds badly as the inks aren't formulated to trap in that sequence, hence running the magenta heavier to achieve a deeper red. Also you will get blacks with a hint of any under color. If you're intent on running the black last a better sequence...

When we used to use coating units with a nip roller application we almost always had streaking problems unless the pan roller was brand new. As soon as there were any, even slight ridges/bumps in the roller the streaks would show up. When we changed over to anilox application all these problems...

We've used it for a couple of years now and it has proven invaluable in calibrating and monitoring the print characteristics of our presses.