I'm in the Uk and haven't had the analysis done, but I'd be interested in it. I think, from memory, I had heard non US based people say they have had it done, but can't be sure.
I agree you're sounding low porosity. My hair is more porous in the areas that are damaged and they are very dry and brittle. Also, the weighing down thing could be combination of low porosity and having fine, long hair.
UK based wavy
Mostly waves, but curls and straight bits too!
Fine to medium, high porosity, medium density, very low elasticity
Highlights damage (growing it out), seems to like protein and need lots of moisture.
Cleanse - CJDF, trying out low poos ; Co wash- Uk chemist brands, Urtekram Rose or Aloe, Hairveda Amala Cream Rinse; RO - varies, Tigi Moisture Maniac, Desert Essence Coconut ; Leave in - Keracare natural textures; Sealant - argan oil
Trying out new things, still looking.