I am disappointed with ColorChecker Passport (CCP) in particular and DNG-profiling in general. I've tested CCP aganst ProfileMaker for various lighting conditions (D50, D65, A, mixed). This program has nothing with color accuracy. Color differences between CCP values and values measured by i1Pro (and taking into account the effect of metamerism for non D50 lighting conditions) sometimes exceeded 25 deltaE  for ColorChecker patches. (Color differences for ProfileMaker did not exceed 2-3 deltaE). And CCP has no settings at all.
By the way, what is the purpose of the file "ColorChecker24_spectral.txt" in CCP directory "win\Reference"? I thought that it was the reference. But it is NOT used by CCP.
That is a large difference.
Not sure I follow the procedure though.
The new chart is made to have a quite uniform spectral response so I can't see the point in having controls for bias of a presumed amount of variance in distribution from D50?
The idea is shoot the chart in the light you are capturing , the response of the captor to the scene or chart in this case have to include the spectral differences. In theory that DNG profile then should place the values so that correct metamerism is reflected in the output of the source colours to working space.
It's obvious it isn't working for you. I would like to find out more. As many are trying on different cameras, systems etc there may be times when it doesn't work. Perhaps you are one instance.
It is working fine on my Canon 5DMKII against any colours I have been shooting and testing visually. I am not going to try to analyse numerically what I don't need to as if the colours repro'd for me are what are sitting in front of me, it does what it should , for me, and my gear.
What I did when I first got it was place the Passport on different copy work, prints, different media, different light, and then built profiles. In each case the colours came in far more precise than using the stock profiles. Again , I know the contrast is boosted, and certain colours are too saturated, but others are so much better than the stock LR profiles.
I only have one Dslr, so I can't test others just yet.
That is why I am very interested in your set up, why it's not working. How many users is it working for , how many not so well, and how many not at all. Delta 25 is for me a too large of error, but again compared to what exactly?