I'm not coarse or low porous, but here's my thoughts in mousse.
I had some success with it in my pre-CG days. Specifically with matrix Curl.life foam.
My thought process back then was that if I got as much moisture out of my hair as possible (literally wrung it out with a bath towel), I could scrunch the curl back in, and using a foam would be lighter and not weigh it down.
Towards the end I was realizing I got better hold with a glaze, while still being light.
I think now with my new found hair knowledge I realize that I NEED that wetness to form the curls, and I NEED the oils and a gel to hold in moisture, etc. I think my hair finds some mousses to be a little drying, and it just needs MORE. My hair is a sponge, and it takes SO much mousse to make a difference. (Especially since it's obviously mixed with air!)
So in MY mind it would seem like mouse would work BETTER for a coarse curlie, simply bc it's not going to suck up all the product.
But others with personal experience are going to have weigh in and help you more!