As you emailed me a few minutes before posting this on the forum as well, I’ll just repeat my reply on the forum so it doesn’t look like I’m shirking my duty here.
Make sure your printer does not have PiezoFlush left in the lines!
You should be getting a dMax in the range of 1.81 with the HD MK so there is something wrong with the printer or workflow here most likely PiezoFlush still in the lines.
You are sure you are printing with the correct curve? Use: K7-WN-UltraHDMK-MASTER.quad
We are using the same batch of ink as you (there is only 1 batch sold currently) on our 3880s in-house at CEP and getting a dMax between 1.81 and 1.85. This is well beyond current canon MK pigment ink let alone the older pigment ink.
Here’s a thread that posts L* values for current canon MK ink. http://forum.luminous-landscape.com/index.php?topic=111764.0
We are well below that in the 12.45 L* to 13.32 L* region.
So something is up with your printer or printers for this to happen.