You should be able to rinse out coconut oil fine with co-washing alone. Recently I experimented with using coconut oil as a LI and definitely had that kind of oily, "over-conditioned" feeling but was able to get it all out in the next wash while co-washing. :-)
2b/c wavy, mid-back and super thick
finally went CG! 08/18/12

co wash: suave naturals tropical coconut
rinse out: tresemme naturals
stylers: GF pure clean smoothing cream & gel

still learning and experimenting