How did you get on with the suggestions raised in the replies to this question?
Did you get any better results?
I quit using shampoo several months ago after reading advice from John Fielder (http://www.johnfielder.com.au/index.html) on the INHS Yahoo Forum. The key points were 1) only wash your hair in water and 2) give it a good brushing.
I've followed this advice and am more than pleased with the results. By brushing, I mean several minutes each day spent brushing the hair in all directions to distribute the natural hair oils as evenly as possible before finishing with my normal style (if you can call it a style!)
I suspect that your idea of leaving coconut oil on your head all day will lead to blocked poors and dirty hair. Using any other product is just asking for destroying your body's natural health and defenses.