I do think it's a low porosity thing. I hypothesized that the protein treatment was the culprit when my hair just wasn't right for about a month. I had done it two PTs in a row (big mistake.) My hair did seem coated after the second one. Wasn't sure that was it or some other product I tried. Did a sulfate shampoo and it was fine.

I do at least one PT a week. The gelatin is the only one that's give me problems. My favorite is the CJ Repair Me. I don't need to DT after I do it.

Before discovering that the gelatin PT was an issue for me, I put it in my okra gel. I did one envelope for 4 cups (rather then one envelope for 1/4-1/3 of a cup) and it's fine. I LOVE my okra gel.
3a (Corkicelli), highlighted, fine, low porosity

HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me, Aloe Fix