Okay, I am done with the Spyder (even if it is called ProSuperDuper-v2 or whatever).
Two of the same panels are being calibrated more than 2000K off (!) of each other with that frickin device, even after several tries …and yes, we did it right.

I used my eyes and some real daylight light and the paper QPCard to fix the smoke vs. ice look. Awesome now.