My hair is low porosity. The SM Smoothie just sits on my hair, too. I use a lot of really rich products with not problem. The Smoothie is too heavy, rather than rich--if you get the difference. My hair LOVES protein. Never met a protein it didn't like. I do at least one PT a week and use a lot of products with protein.

If you're looking for a drugstore brand that might work, a lot of folks love the Yes To products (carrots, tomato, cucumber and blueberry.) You can buy them at places like Whole Foods, Walgreens, etc. Their website has a list.
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