I slide my thumb and index finger on one strand of hair and it squeaks super loud (lol) as well as my fingers kind of "catching" and stopping midway a few times. My hair swallows everything... water, conditioner, stylers, etc... but then after a while, it becomes quite dry and flyaway. My hair is porous. It also floats forever in the water test, so I don't trust the float test either.
If you have high porosity hair, try a protein treatment. If you have low porosity hair, try an intense moisturizing treatment.