Well, I have also seen a bunch of "Real World" tests of K&N filters. A lot of guys took the bait and put them on their off road rigs. In every case, at the next service you would see fine dust AFTER the filter. You did not see that fine dust after the filter using the OEM paper filters. The only way to flow more air through the same surface area is less constriction. That means more very fine dust is going to pass though with the air.
Since you are a testing expert, perhaps you would like to do a"proper" test that meet your criteria andlet us know what you find, but for me, my eyes and experience tell me, no K&N on off road rigs.