I don't know what I'm doing wrong but somehow I'm not able to get a decent calibration for my DesignJet Z6200 (heavy stock paper). Regardless of which program I use, every time I try to verify my profile against common profiles (like ISO Coated) I get a median DeltaE of 8 and a max. of 25 ... even on primary colors :-(

I mean, the prints look okay and I even tried different measurement devices (printer's internal i1, external ES-1000 and ES-2000) but the results are nearly the same. Tried it with either Colorgate or EFI Fiery XF (starting with Linearization, followed by an ECI chart to build the profile).

Is there some "magical step" I'm missing?

Thanks for any help...