Sounds like you have a protein/moisture imbalance. I would tackle that first---that appears more your problem than simply having low porosity.
As far as actual products go for LP, they'd technically be the same as for any other porosity, except for maybe more watery, because they absorb faster than a thicker product.
In your case, I'd try lowering the protein and putting in more moisture. I switch to Tresemme Naturals whenever I'm feeling over-proteined, and let it soak in a loooooong time (1 hr minimum, usually). A protein-free deep condish that I use is CJ Curl Rehab (though I usually mix it with another conditioner).
Hair Type: 3c, Med-High Density, Low Porosity
CG since '09
Low Poo: KC Come Clean
Condish: AOHR, TN (Avocado), TJ Balancing Moisture
Leave in: GDL, KBB
Curl Lotion/Gel: CHS/CK
Others: CJ Curl Rehab, Jojoba Oil