I'm naturally high porous, too!
I find my hair drinks oil, and can't get enough protein. In fact, the protein/moisture balance for me seems to be "get as much as possible of both".
I too have found that the OCCASIONAL gentle sulfate poo works well on me. I use it to clarify, and be sure to do a PT/DT afterwards. My hair is a LOT curlier and shinier after taking those steps.
I'm not sure if that (the sulfates being good when used on occasion) is connected to my porosity or not, but I guess it bares mentioning.
No issues with white residue, unless I mix a LI with a gel it doesn't like, or AVG (Which I don't use straight onto my hair anymore, bc my hair seems to only like it when it's in a product.)
Sealing (with MO) is a MUST for my hair!!!
2c/3a/3b, Fine/med, Dense, high porous, & normal elas.
Lo-poo - Renpure Keratin, SMR, Giovanni SaS
clarifying - mix Johnson's H2T with low poo
Co-wash - Suave Nats. clar. or coco.
RO - GVPCB, Ion Eff. Care, TN.
LI - SMR, Cure Care, or RO
Seal - MO or Jojoba
DT - + honey, ACV, & EVOO to SM masque & GVPCB
PT - Gelatin!, CNPF
Styling - FSG, AIF, BRHG, LALS/PS, GF curl spray gel, SM Souffle/Smoothie, LOOB
Oils - MO!, EVOO, jojoba, GSO, SM Elixer, EVCO, VO5 Hairdressing