Porosity can be tricky to figure out. It can also change as your hair gets healthier. Hair that is damaged from chemicals and heat can be very porous but can get less porous as the damage is reversed or the hair grows out. Maybe the hair on the back of your head is showing more damage? I cannot handle much oil. Partly because my hair is fine and oils weigh it down. I'm also medium to low porosity. Many products (or too much of the right ones) will just sit on my hair and not penetrate and soak in. That can leave me feeling weighed down, limp and producty.
Even though my porosity is on the low side, my fine hair loves protein. I use protein rich products and regular protein treatments. But that wasn't the case when I first started. At that time, I was dry and heat damaged and needed regular deep treatments for moisture. As my hair got healthier, I backed off of the moisture treatments and increased the protein.
You may want to try a protein treatment and follow it up with a moisture treatment to see how your hair responds. If the back of your hair likes the oils but the oils are too much for the rest of your hair, you might try just using some as a leave in on the back of your head?
It's really all about experimenting to see what will work best for you. Keep reading and trying different techniques and products!
3B, fine, normal to low porosity
Modified CG since June 2010
HGs: FSG, anything with glycerin, Tresemme Naturals conditioner, Curls Like Us cloths, satin pillowcases.