I may be doing this wrong, but I thought when I checked mine on nc it goes by where the wave or loose curl starts. Mine starts at the root so I was 2c, yours starts at eye level so you are 2b, below that is 2a. I don't remember it being about how tight the wave is. I think that is more for the curlies.

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2c, some straight pieces on canopy, curlier underneath. Fine, thin, unsure on porosity - sent in my sample and waiting to hear back. Products - have a bunch I am trying out, CJ, Deva, SM Yucca, TJ.