Read between the lines. The statement of what can’t or won’t be shared is completely obvious and has be restated consistently and repeatedly. The basis of the 320 or the 200 speed rating is to be taken as an act of faith as a starting point.
The 25 rating is based in an experimental analysis and has been disputed. The 80 is conjecture. All worth considering yet none so definitive that the others can be excluded.
Buy and try is how the film is being marketed. Who are we to try to change that?
It’s the continued arguments about not getting the answer and not liking the style of answer given that has made this an embarrassing mess… more for Photrio than for CatLabs IMO.
Yes, I even disputed my own results after I got them back the first time. This is why, I bought more film and ran the test again. The results were nearly identical, well within the margin of error. I actually, ran the test the third time. I would gladly continue testing and sharing my results but the OP made it clear that
they are not taking this thread seriously, so I will no longer post in this thread. It's a waste of time.
If I had to give you my conclusion, I would say that the Catlabs film is technically slower than the advertised ISO 320 and, not even close to being capable of reaching ISO 1600 (Catlabs recommends "pushing" the film to ISO 1600 on their website). Even if you don't put faith in the actual ISO number my analysis produced, you can see that the film is about three stops slower than 400TX under experimental conditions. In the "real-world," one should expect similar results, subject, of course, to the usual variability inherent in film (and hybrid) photography.
As to why the film turns out slower than advertised, I would hazard an (educated) guess that the film, in addition to being inherently slower than mainstream medium-speed films (e.g., 400TX, HP5+), is not quite panchromatic, and has a significant dip(s) in sensitivity along its spectral response curve. I started testing its spectral response, but I can see that it is a waste of effort so I will not conclude the test. The OP does not care, and it's absolutely their prerogative. I have no intention of telling them how to run their business. Bringing a film to market (whether new or re-badged) is a huge undertaking.
Catlabs deserve sincere congratulations on succeeding. I am seriously impressed that they were able to offer this film in 135 and 120, and at competitive prices!
Nick