My hair is high porosity too and it LOVES protein. Highly porous hair usually needs more protein. I would recommend a protein treatment. If you're worried about how it will affect your hair, do a spot test. Good luck!
2b//high porosity//fine texture//medium density//low elasticity//loves protein
Lo-poo: SMMR, SMC&S
Clarifying: VO5 shampoos
Co-wash: VO5 conditioners
RO: VO5 conditioners
Styling: AIF, FSG, gelatin gel
PT: IAGirl's gelatin treatment