So, my first question is, how do I find my porosity? I'm not sure if you can tell for me, but here's a picture

Another thing is, how do I stop shrinkage? When I pull one of my curls, I notice that its actually twice as long as it normally works. I just bought a good blow drier and a diffuser (which I think is used to dry curly hair more evenly without breaking up the curl cuticle?) and have seen some videos on youtube about stretching curls (basically pulling them and then blasting the roots with hair). I refuse to use any kind of heat, so I'll be using the cold setting.

Any thoughts on any of this?