Low porosity hair is usually quite healthy. You don't say what other products that you're using. My hair doesn't care for straight oils/butters, but likes them in products. I use minute amounts of really rich products all of the time. It takes my hair a long time to absorb products, in general. My hair is frequently dry before my products are absorbed. My hair just gets better as the day goes on. My hair is so moisturized, I never DT and the shampoo guy at the salon won't condition it after he shampoos it--he thinks it's healthy enough (IMHO, he just doesn't "get it.")
I'd try using some DTs that aren't straight oil. Something like CJ Curl Rehab comes to mind.
3a (Corkicelli), highlighted, fine, low porosity
modified CG, since April '07
CG since 3/11/08
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